VCS3FJ

The code implements the multiplayer and hall-of-fame design, but the delivered evidence does not show it working. The required completion note .ololo/scorched-multiplayer-done.md is absent from the file tree, and the prior results confirm it is missing. None of the attached screenshots show a hosted or joined match, a remote shot, or the hall of fame. Those images belong to the earlier arsenal and shop work. The task's required two-browser screencast is not among the artifacts I can see. Scenario coverage in code is reasonable: a room is created with an invite code and link (server/rooms.js create/join, src/lobby.js:73-75), both players share one seed (rooms.js join broadcasts start with seed and names), moves are relayed in one global order with replay on reconnect (rooms.js subscribe, src/online.js), a mid-match leave forfeits to the remaining player (rooms.js abandon, after a grace timer), and results persist to a JSON file (server/hall.js save/load). Ranking matches the pinned order: rankPlayers sorts by wins, then damage, then name (server/hall.js:6-8). Weaknesses: results are reported by the clients (type: 'result' in rooms.js post), so a client could submit a false winner. Rooms live only in memory. The hall file defaults to data/hall.json with no note on hosting. Without a running two-browser recording or the completion note, I can only judge the design from code, and the deliverable is incomplete.

No screenshot delivered for the new surfaces this task adds: the Play online lobby (index.html:15, src/lobby.js), the invite panel, or the hall of fame (src/hall.js). The probe I tried to register returned 'session is over', so no capture was possible. The attached desktop and mobile images show the solo duel and arms shop from earlier tasks, not the multiplayer flow. Scoring them as this task's UX would be grading by imagination.

Cannot judge contrast or rendering of the lobby or hall panels without a capture. The markup has some semantics: the lobby uses an h2 and role=alert on the error line (src/lobby.js), and the hall renders a real table with th headers (src/hall.js). Those are markup-only observations and do not replace seeing the render.

No narrow-viewport capture of the lobby, invite, or hall panels was delivered, and the screencast of two browser windows that the brief requires is absent. The only mobile images are from earlier tasks. Narrow-layout behaviour for this task's surfaces is therefore unassessable.

Storage and ranking are well centralised: the hall lives in one server module (server/hall.js: Hall, rankPlayers, record, persisted to HALL_FILE set in serve.js), and the client reads it only through fetchHall/renderHall (src/net.js, src/hall.js). Data-layer separation is good: parsing and validation sit in server/rooms.js (sanitizeMove) and the online state machine in src/online.js, not in presentation code. The main defect is provenance. The match outcome that goes into the hall is client-reported: post() in server/rooms.js accepts a 'result' move carrying a winner, damage and wins, and finish() writes them straight into hall.record() without checking them against the server's own state. Any seat can post a result for itself, and forfeit scores use room.stats, which only seat 0 supplies via 'stats' moves (src/main.js onTurnSettled). The hall's wins and damage therefore rest on client claims, not on a single verified source. Smaller duplication: the weapon ids are hardcoded again in server/rooms.js (WEAPON_IDS) instead of read from src/weapons.js, and the key-binding duplication flagged in earlier rounds is still open. The shared-source and separation work is sound, but the hall's integrity depends on unverified client input.

Partial credit. The server seam is the best structural work in the series: server/rooms.js imports nothing from node or http, and its match rules (create, join, post, abandon, finish) can be tested without a socket. server/app.js is the edge, and src/online.js takes an injected send callback. The client rules still hold: game.js imports only terrain, physics, rng and weapons, and online.js imports only STATE from game.js. Against that, the dependency rule and the proportion test are not fully met. (1) Game's default seed still calls randomSeed() (src/game.js constructor), and Rooms defaults random = Math.random (server/rooms.js constructor). The previous reviews asked for injected seeds and this was not done. (2) Debris is still rolled inside the rules (rollDebris in src/game.js) and the trail is still recorded in Game (recordTrail). This is the third review asking for the move. (3) Network concerns now leak into the core: controlSeat, inputLocked, shotsFired and names live in Game, which the online layer depends on. (4) server/hall.js mixes filesystem persistence with the pure ranking in one class, and rooms.js calls the concrete Hall.record rather than a declared port. (5) The tree is still technical: src/ is flat with controls, game, render, ui, lobby, net, and server/ is app, hall, rooms. Nothing is grouped by shell, tank, duel or hall. Proportion is reasonable for a two-hour build, so the penalty is for the unfixed core defects rather than over-engineering.

The new modules are mostly well named (OnlineMatch, judge/targetStage, Rooms.finish, renderHall) and there is no obvious large copy-paste. Several smaller hygiene problems remain. controls.js perform() and performOnline() repeat the same cycle/weapon/leave dispatch chain (controls.js:76-88 vs 37-60). window.game is assigned twice in main.js (useGame at ~line 50 and again at the bottom before fitCanvas). showHall does session ? ... : [] then names ?? [], which is a redundant guard. leaveOnline returns true for no reason. app.js:105 returns cleanName from createApp although nothing uses it. sanitizeMove and CLIENT_MOVES (rooms.js:4 and :22) keep two separate lists of the same move types. No duplication tool output was supplied, so this rests on reading the code.

Most functions are short and the online pipeline is documented: judge/apply/lapse with stageOf makes the rules readable, and Hall/Rooms are testable classes with injected timers. Weaknesses that slow a newcomer: lobby.js:~84 uses positional access menu.children[4].append(...), which breaks silently if the markup order changes. Magic values are inline: the 600 ms defeat delay in main.js route(), the 1e6/1e4 bounds and 5/100/180 ranges in sanitizeMove, stageOf's * 10 and the targetStage 1/9 stage numbers, and the 24-character token length. The boundary trusts the client: Rooms.finish records wins and damage from a client-sent result move (rooms.js finish/post), so the hall's integrity rests on a client message rather than on server-side state. Error handling at the HTTP edge is sound (RoomError status mapping, body size cap, corrupt-file fallback in hall.js load).

The diff has several real end-user touches beyond the brief, all visible in code. An invite link opens the lobby pre-filled with the code (?join=CODE, src/main.js and src/lobby.js). The chosen name is remembered in localStorage (src/lobby.js:6-22). Duplicate names are auto-suffixed with ' 2' (server/rooms.js join). Opponent's barrel angle and power are shared live while aiming, throttled to 0.1s with ephemeral events kept out of the log (src/main.js shareAim, server/rooms.js broadcast). A dropped player gets a 4s grace window and replays missed events via Last-Event-ID before a forfeit is recorded (server/rooms.js subscribe/unsubscribe/abandon). The hall of fame highlights the viewer's own row and lists recent results with forfeit labels (src/hall.js). These are coherent and fit a two-player duel. Nothing is a signature moment, and I could not confirm the live flows in motion: no multiplayer screencast is in the tree and no probe was registered. The shipped screenshots show only single-player and shop views. The done-note .ololo/scorched-multiplayer-done.md is also absent from the file tree.

The desktop solo capture has a clear hierarchy: player cards at top corners, a centred turn banner, wind and round line, and a labelled button row. The Mode button reads as a real control. The mobile layout is a real improvement: the canvas HUD is hidden on narrow screens and replaced by compact status cards with name, HP bar, angle/power/weapon, money and round pips, plus a centred round/wind line. Deductions: the mobile centre text ('Player 1 aims Round 1 Wind ▶1') is small and wraps awkwardly, and in the mobile shop capture the overlay sits over faded controls, which muddies it. The dirt-collapse and tank-fall motion cannot be judged from stills. The desktop solo frame shows an arch-shaped cavity, which is ambiguous as evidence of collapse.

The status cards and turn text are real DOM (src/ui.js buildStatus writes textContent), which is better than the earlier canvas-only HUD that a previous verdict faulted. The HP bar colour is backed by numeric 'HP' text, so colour is not the only signal. Weaknesses: the disabled weapon buttons (2 Big Bertha, 3 Nuke, 4 MIRV at ×0) are very low-contrast grey on navy in the captures; the keyboard hint text is tiny; the status element has aria-label but no live region, so turn changes are not announced; the canvas remains the main battlefield with no text alternative. The mobile shop overlay's background bleed also lowers legibility of the dialog.

At 375px the battlefield, status cards, weapon bar, Angle/Power controls and Fire button all fit in one viewport with no horizontal scroll, and the page is cleaner than before. The touch hint replaces the keyboard hint on coarse pointers (style.css pointer:coarse block) and buttons get a 44px minimum, which meets touch-target sizing. The shop becomes a fixed full-width overlay on narrow screens with its Buy and Done buttons large. Deductions: the canvas is only about 350px wide, so the terrain and tanks are small; the shop overlay leaves the controls faintly visible behind it; and touch play (drag to aim) is not visible in any still, so it rests on the code and the webm the brief requires. The narrow capture also shows a stale 375px frame of the older build, so not every delivered image reflects this commit.

The committed code covers all four scenarios and the design is coherent. Falling earth: terrain is now a solid-cell grid (src/terrain.js, carve/dropOneRow/settle), so blasts leave hanging dirt that tumbles row by row until at rest. Tanks fall with the ground under gravity and take 0.5 HP per pixel beyond a 22 px safe fall (src/game.js settleTanks/landTank, CONFIG safeFall/fallDamagePerPixel), so damage grows with drop. The rival (src/rival.js) simulates shots with the game's own ballistics, starts with a deliberate 90–140 px bias, and observe() cancels 85% of each observed miss, so successive shots should tighten. Touch: pointer drag aims (src/controls.js aimAt), a Fire button is present, the canvas has touch-action:none, and a compact status panel shows below 720 px. Deductions: the live behaviour (dirt collapse, fall damage, rival convergence, touch play) rests on the code and on screencast files I could not view as frames, so it is not visually confirmed here. The shop overlay in mobile-shop screenshot lets the controls show through behind it, which looks sloppy. The completion note's '73 unit tests' claim is unverified.

The core is still framework-free. terrain.js, physics.js, weapons.js, rng.js and game.js import no DOM or browser APIs, and game.js has no wall-clock calls, so the dependency rule mostly holds at the center. Terrain is now a solid-cell grid with settle() as a pure step, and game.js tests can run without a browser. Several defects remain. Game's default seed still calls Math.random through randomSeed() in the constructor (game.js constructor, seed = randomSeed()), which is the randomness inversion I asked for last time and did not get. The new Rival also defaults to rng = Math.random in its constructor (rival.js). Debris generation is still rolled inside the rules: explode() calls rollDebris() (game.js) and stores the visual debris in blast records. The trail is still recorded in the rules via recordTrail() inside stepShellOnce(). Tank fall integration (settleTanks/landTank) is physics living in Game rather than physics.js. Rival reaches into game internals (game.config, game.muzzle, game.terrain, game.tanks), so the AI is coupled to the rules object rather than to a declared interface, though the code stays pure and testable. Layout is unchanged: src/ is still flat and technical (controls, ui, render, main, rng, rival), with no shell, tank, shot or duel folders at the top level, so the tree does not scream the domain. On the positive side, render.js builds its terrain picture in an offscreen cache (terrainLayer/paintTerrain) and touches the DOM only at the edge. The narrow-screen HUD toggle, however, is passed into draw() as a hud flag from main.js, which mixes a viewport concern into the renderer. The seams are proportionate for a competition build. Overall this is the same architecture as the last two rounds, with the three previously requested fixes still absent and one more Math.random default added.

Several extras go past the brief and are wired into the code. The strongest is touch aiming (src/controls.js aimAt, lines ~76-88): the drag direction sets the angle and the drag distance sets the power, so a phone player aims with one gesture. The rival is more than a scripted shooter: Rival.observe (src/rival.js) learns a horizontal bias from each miss and cancels most of it, which gives the shot-walking convergence the brief asks for. Other working touches include a solo mode toggle (C key or ?mode=cpu, src/game.js playerName and index.html #mode), compact status cards for narrow screens (src/ui.js buildStatus, style.css .status), a bottom-sheet shop on phones (style.css @media max-width 640px), a cached terrain layer repainted only on version change (src/render.js terrainLayer), and row-by-row dirt tumbling with a fall budget (src/terrain.js settle/dropOneRow). The mobile and shop screenshots in .ololo/artifacts show the layout fitting a narrow screen. I did not view the solo-vs-computer.webm or mobile-touch.webm screencasts in gravity/, so the rival and touch behaviour is credited from code only. Nothing here is a signature moment a demo audience would remember, which keeps this below the top band.

Several good moves: rival.js names its tuning values (THINK_TIME, AIM_RATE, FIRST_MISS, CORRECTION, EXACT, SEARCH), controls.js names DRAG_FULL_POWER, and the two terrain walks in render.js are folded into one paintTerrain pass. Against that, the diff leaves real clutter. style.css repeats the .status .head rule in two places, once inside the main block and again appended at the bottom, plus a separate .status .name, .status .hp block tacked on at the end. test/arsenal.test.js has a mis-indented line ( game.explode(c.x - 80, ...)) left after a removed carve call. terrain.js hard-codes 220 as DEFAULT_DIRT_SPEED while CONFIG.dirtFallSpeed also says 220, so the same value lives in two places. No duplication or lint measurements were supplied, so this rests on reading the code.

The rival is split into small steps (observe, makePlan, takeAim, shop), and the settle and fall logic in terrain.js and game.js is isolated, which helps a newcomer. Weak spots: simulateLanding in rival.js:~27 uses an unnamed age < 12 time cap and a nested find inside the integration loop. countDown in game.js is harder than it needs to be: waited plus timer > -settleTimeout is a double negative that is easy to misread. The pointer handler in main.js has a single line of inline coordinate math, roughly 130 characters long. The status-card builder in ui.js hard-codes the health colour thresholds 0.5 and 0.25. Error handling is largely unnecessary here since everything is pure logic. Overall a newcomer could change this, but with some reading.

The new pure-logic tests are concrete and mostly specify behaviour with numbers. Terrain: test/terrain.test.js checks exact column heights after carve, that hanging dirt tumbles and the total solid-cell count is conserved, and that bedrock is never breached. Tanks and damage: test/game.test.js checks that a 20px fall costs 0, that longer falls cost more, and that fall damage can finish a tank. Rival: test/rival.test.js checks that the computer fires unaided, that the first miss is over 60px, that the next two shots land closer, that a near-exact shot zeroes the bias, that the shop buys nuke and bertha, and that simulateLanding matches the real shot within 12px. Controls: test/controls.test.js covers pointer aiming and the human-lock while the computer acts. Weaknesses: the convergence check is one seeded run (rng seed 3) and only asserts misses[2] < misses[0], not a monotone tightening. The 'stuck settle' test contains a no-op line (game.tanks[0].y = game.tanks[0].y). The wind-shift assertion (seen.size > 3) is loose. Nothing automated covers the browser glue added this round: the canvas pointer-to-world mapping in src/main.js, the narrow-screen HUD toggle, the status cards in src/ui.js, or the 'battlefield fits without scrolling' requirement. Those rest on the screencasts (gravity/mobile-touch.webm, gravity/solo-vs-computer.webm) and the shop PNGs, which are not verified by any test. There is also no integration test that runs the assembled game headlessly through a fall, a computer turn, and a touch aim.

Terrain has one source of truth: the solid-cell grid in src/terrain.js (solid, with tops as a cache kept in sync by setColumn, refreshTop and dropColumn). Tuning values live in one frozen CONFIG in src/game.js (dirtFallSpeed, tankGravity, safeFall, fallDamagePerPixel, settleTimeout) and are passed into generateTerrain and Game, not redeclared. The old fallSpeed is removed. rival.js reads ballistics from game.config and calls game.muzzle, game.tankCenter and terrain.isSolid, so it does not keep its own copy of physics. The new playerName() in game.js is the single display-name source, used by the canvas HUD, the status cards and the banner. The status cards and the mode button are derived each frame from game state, not hard-coded. No mock or sample data ships. The task pins no external dataset, so there is no sourcing question. Deductions: the solid grid and the tops heights cache are two representations of the same ground that must be kept in step, which is a mild drift risk. The key-binding duplication between index.html (the data-key attributes and the .hint.keys kbd text) and src/controls.js is still open; I already faulted it in earlier tasks and am not charging it again. The new .hint.touch copy is static prose, which is acceptable.

On desktop the arms shop reads cleanly: a bold title, a green money line, three weapon rows with prices, owned counts and Buy buttons, and a full-width Done button (probe:2119f3e2 desktop capture). The wind readout ('Wind ◀◀◀◀ 10') and the round line sit clearly under the turn banner in the HUD. Hierarchy is sound. Points against it: the live-play HUD text (wind, money, rounds) is small at 13px on the canvas, and the round-result banner is not in any capture. The wind-bent arc and MIRV split were not shown in motion; no webm was delivered for this task, so those flows are unverified.

The shop and weapon bar are real DOM: an h2 title, a list of rows, and buttons with text labels such as 'Buy (2)' and 'Done (Enter)' (src/ui.js:37-60). That is good semantics. The main game state (whose turn, wind, money, rounds) is still only painted on the canvas (src/render.js:200-215), so screen readers cannot reach it, as I noted for the previous build. Disabled buttons drop to opacity 0.4 (style.css, button:disabled), which is low contrast in both captures. The canvas HUD text is about 13px in the 375px capture and barely legible.

At 375px there is no horizontal scroll, and the controls stack and wrap. But the shop overlay is absolutely positioned and centred inside a stage that is only about 400px tall, so its top is cut off: the 'Player 1 — arms shop' title and the top of the panel run past the top edge of the canvas. The panel also overlaps the weapon bar below it, which shows through the bottom edge. The overlay's own rows and the Buy buttons are touch-sized and legible. The canvas HUD is unreadable at this width, which I had already faulted on the duel.

The core is mostly clean. game.js, physics.js, weapons.js and terrain.js import no DOM, canvas or framework code; the only imports are sibling pure modules (game.js:1-4). The rules are unit-tested directly without a server: test/arsenal.test.js builds a Game from a seed and drives it with update(dt). The new weapons table (weapons.js) is plain data that the core reads. The shop and HUD are separate edge modules (ui.js, render.js) that import the core, not the reverse, so the dependency direction holds for the new features. Against that, several defects from my earlier review of this codebase are still present. The Game constructor still defaults its seed to randomSeed(), which calls Math.random (game.js constructor, seed = randomSeed()), so the core reaches for ambient randomness. Debris generation still lives in the rules: rollDebris() sits in game.js and is stored on each blast, so presentation data is rolled inside the core. The trail is still recorded inside the rules (recordTrail in game.js). The tree is still flat and technical: src/ holds game, physics, render, controls, ui, weapons, main, with no domain-named folders such as shell, tank or shop. controls.js also imports STATE from game.js and dispatches into Game, which is acceptable as an adapter but couples input to the rules' internals. Given the small scope, one rules module with a few edge modules is a reasonable size, so the proportion is fine. The failures are the leftover randomness and presentation in the core and the flat technical layout.

The committed core (commit 787a817) implements the spec: angle/power controls with arrow keys and Space, gravity-driven shell (physics.js stepShell), terrain carving (terrain.js carve), linear blast damage of 30 at centre to 0 at edge (physics.js blastDamage), health panels, turn passing after landing, and a winner banner that stops play (game.js explode/findWinner, render.js drawBanner). The delivered screencast frames show a shell in arc, Player 2 dropping from 100 to 70 HP after a near hit, a dented crater at the impact site, and fresh random terrain across rounds. However, the frames show features absent from the committed code I read: wind, money, a weapon shop (Big Bertha, Nuke, MIRV), and a best-of-3 round system. Neither game.js nor render.js in the commit contains these, so the screencast does not match the tree being judged. No frame shows a duel ending with a winner, which the brief specifically requires. The done note's claim of '33+ unit tests, full coverage' could not be verified from the evidence shown.

The pure-logic suites are substantial and mostly assert concrete values. test/arsenal.test.js pins the price table (line 'the price list matches the arsenal table'), money at $10/point with no self-pay or overkill pay (damage pays test), round-end shop/terrain sequencing, the first-to-three match rule, and stock fallback to the Missile. test/game.test.js adds a wind-bend comparison (tailwind lands ~50px further than headwind) and a draw case. The main weaknesses: (1) no tests at all for the browser-facing pieces that carry the new flows: src/ui.js (weapon bar disabled states, shop buy-button enablement), src/render.js (wind gauge text, MIRV shell sizing, banner text), and main.js wiring. The wind indicator, shop purchase and MIRV split scenarios are only verified by the screencast the player supplied, not by any automated test. (2) The MIRV split test in test/arsenal.test.js ends with assert.ok(game.shells.every((s) => s.split) || game.shells.length === 0), which is a weak, partly vacuous check. (3) The heavier-weapon test (arsenal.test.js, 'heavier weapons hit harder') expects exact centre damage of 40 for Big Bertha and 0 for Nuke from a drop 40px above the tank. Those values look hard to reconcile with a shell that detonates near the tank centre, and I could not confirm from the visible code that the expectations hold. It needs a run to confirm. The player's note claims 52 passing tests, which I have not verified. No integration or end-to-end test exercises the assembled game, so the level mix is unit-only.

Several working touches beyond the brief, none of them a signature feature. Animated wind streaks drift at wind speed and lean with the wind (src/render.js drawWindStreaks, ~L173-185), which makes the wind readable at a glance. Each weapon gets its own shell colour and size (src/render.js SHELL_COLORS and drawShell). Keyboard users get 1-4 digit hotkeys and Tab cycling, with cycling skipping unowned weapons (src/controls.js TAP_KEYS; src/game.js cycleWeapon, covered by test/arsenal.test.js). The shop greys out unaffordable items and labels the Done button by whose turn it is (src/ui.js buildShop). Status panels show money and round-win dots, and the banner reports the $500 bonus. The submitted screenshots show the weapon bar with stock counts, the wind gauge, and the money/rounds panels rendering. I did not see a screencast of the wind, shop or MIRV in motion, so the MIRV split and shop purchase flow are scored from code only. Solid usability polish, but nothing the demo audience would remember.

The game logic is cleanly restructured. Shell, weapon and player state is named clearly (stepShellOnce, resolveImpact, consumeAmmo, applyBlast, endRound), and perform() in controls.js replaces the old string-prefix dispatch. Three things pull the score down. First, drawWindGauge in render.js:200 is a single 170-character line with a nested ternary that repeats the Math.max(1, Math.ceil(strength / 3)) expression twice. Second, drawShell (render.js:133) packs size selection into a nested ternary (mirv && !split ? 5 : nuke ? 6 : 3.5). Third, bannerText (render.js:283) names a local draw that actually means 'is a draw', which reads as a rendering call. The terrain-walking loops in drawTerrain (render.js:63 and ~77) are still duplicated, as I noted on the earlier task. No duplication tool output was supplied, so this rests on reading the code.

The rules are well separated. Weapons live in a data table (weapons.js), and game.js keeps its state transitions explicit (finishShot, advance, endRound) with the new CONFIG values named (damagePayPerPoint, roundBonus, splitMinAge). The shop and weapon bar are isolated in ui.js, and the MIRV split is a pure function (splitMirv). Several things still make it harder to change safely. The layout literals in render.js are still unnamed and sprinkled through drawStatusPanel (widths 230 and 86, y offsets 33, 68 and 88), and drawWindGauge buries a magic divisor of 3 in an unreadable line. The drawShell size literals are also unnamed. Nesting is shallow and functions are short, so the main risk is render.js readability. The boundaries hold up: applyBlast clamps damage to remaining health before paying, and buy checks affordability and price before mutating state.

The core flows look implemented and coherent in code. Wind is rolled per turn (game.js rollWind/countDown), applied as horizontal acceleration in stepShell (physics.js), and shown as a HUD gauge plus drifting streaks (render.js drawWindGauge/drawWindStreaks). The arsenal matches the pinned table (weapons.js), and damage pays $10 a point via applyBlast (game.js). The round bonus, the first-to-three match rule, and fresh terrain per round are in startRound/endRound. The shop runs between rounds through advance() and buy() with a stock fallback to Missile. MIRV splits at apex via shouldSplit/splitMirv. The hit.png screenshot shows $300 for 30 damage, consistent with the economy. Gaps: I could not confirm from the artifacts that a screencast shows the required sequence (wind indicator, bent arc, shop purchase then fire, MIRV splitting mid-air). The delivered duel.webm is the only video and its contents are not verified against the required scenarios. The completion note's '52 unit tests' claim was not checked. Shop and MIRV behaviour were verified from code only, not from a running game.

The arsenal lives in one place. src/weapons.js declares WEAPONS, WEAPON_ORDER, FREE_WEAPON and PAID_WEAPONS, and the prices, blast radii, craters, damage and MIRV spread all come from that object. game.js no longer carries weapon numbers: CONFIG dropped maxDamage, blastRadius and craterRadius, and the economy constants (damagePayPerPoint, roundBonus, roundsToWinMatch) sit in one CONFIG. The shop (src/ui.js), weapon bar, status panel (render.js) and tests all read from WEAPONS, so the price list is not redeclared in presentation code. Data handling is separated: purchase, ammo and payout rules are methods in game.js (buy, consumeAmmo, applyBlast, endRound), and ui.js only displays them. Honesty of sourcing holds: money comes only from measured damage (applyBlast pays dealt * 10) and the round bonus. Remaining defects are small. weapons.js keeps a warheads: 5 field alongside a spread array of five entries, so the warhead count is stated twice. The shop/hint copy in index.html ("1–4", "2–4 buy") repeats key bindings that also live in controls.js, which is the same duplication the earlier round flagged and it is still unresolved. Shell colours and sizes in render.js (SHELL_COLORS) are a presentational table keyed by weapon id, which is acceptable. A duplicate gravity/duel.webm copy of the artifact is committed at the root, but it is a media file, not a dataset.

The desktop capture has a clear hierarchy. The centred turn banner ("Player 1 — aim and fire") is the headline, the two player cards carry HP bars and key values (angle, power, weapon, money, rounds), and the control row sits directly under the battlefield. The mid-flight frame shows a visible shell trail, and Player 2's HP drops to 70 with a crater cut into the hill beside the tank. The main weakness is that the wind and round text is small and grey on the sky gradient.

The markup is reasonable: lang="en", a labelled canvas, real elements with aria-labels, and a text hint built from elements. Health is shown as a numeric value plus a bar, not colour alone. However, the canvas HUD text (player names, HP, angle/power, the hint line) is small and low-contrast on the dark sky, and the canvas content is not exposed to assistive tech beyond the one label. The turn and winner state live only in canvas pixels, which weakens screen-reader access.

At 375px the page stacks vertically: the canvas, then the weapon, angle/power, and fire/new-match rows, and the hint wraps cleanly. No horizontal scrolling or overlap is visible, and the buttons are reasonably touch-sized. The weakness is that the canvas scales down so far that the HUD (player cards, turn banner, wind) becomes tiny and hard to read, and a large empty area sits below the controls. The mobile capture was delivered and checked, so this is not a null score.

The modules are small and named for what they hold: terrain.js, physics.js, game.js, controls.js. Pure logic is kept apart from the DOM, and constants sit in a frozen CONFIG (game.js:8-31). The diff shows no visible dead code and no obvious copy-paste. Deductions: main.js:21-36 handles Shift by string-prefix matching (code.startsWith('Shift')) and stores it under a synthetic 'Shift' key, which is harder to follow than it should be. drawTerrain (render.js) walks the heights array twice with near-identical loops. Tank geometry in drawTank (render.js) is a set of unexplained literals (x - 17, 34, 28, 9, 7).

Nesting is shallow and most functions are short: shell stepping, impact checks, and blast damage each live in their own method (game.js:131-185), and the physics helpers are pure and unit-tested. Boundaries are guarded: a shell that leaves the map is a miss (game.js checkImpact), and blast damage is clamped at 0. Tests cover the rules (test/game.test.js). Weaknesses: render.js holds many magic pixel values for the HUD and tank drawing (e.g. HUD width 220, panel offsets 12/33/41/68) that a newcomer would have to reverse-engineer. drawBlast and drawHealthPanel mix layout and state logic. The key-handling state machine in main.js is split across keydown, keyup, blur and pointer handlers, which makes it harder to change safely.

The core is clean and points inward. terrain.js, physics.js, rng.js and the rules in game.js contain no DOM, canvas, or server references. Their only imports are sibling core modules (game.js:1-3 imports terrain, physics, rng), and the tests exercise Game directly with no server or browser (test/game.test.js). The outward edges are the expected ones: render.js imports STATE from game.js (render.js:2) and main.js is the only module that touches the DOM and requestAnimationFrame. Deductions: game.js:1-3 pulls in randomSeed (Math.random) as a default constructor argument, so the core reaches for ambient randomness rather than receiving it. Game state also carries presentation data: rollDebris() generates debris velocities for the renderer (game.js rollDebris), and trailLength and debrisCount sit in CONFIG (game.js:CONFIG). The render concern leaks into the rules object. There are no ports or interfaces, which is proportionate for a single-screen game with no storage or network. The top level (src/, test/, index.html) is named by function (terrain, physics, game, controls, render) rather than by the duel's domain concepts (tank, shell, duel), so it only partly screams the domain. Overall this is a proportionate, well-separated structure with a few view concerns leaking into the core.

Source of truth is clear: all tunables (health 100 via CONFIG.maxHealth, blast damage 30 via CONFIG.maxDamage, radii, gravity, dimensions) are declared once in src/game.js CONFIG, and render.js/terrain.js/physics.js read from config or are passed values. Terrain is generated from a seeded RNG per duel (src/terrain.js generateTerrain, src/game.js constructor), so there is no shipped mock or sample terrain. Blast damage is derived from a single pure function blastDamage (src/physics.js) with linear falloff 30→0, matching the spec. Data layer is separated: terrain/physics/game/controls have no DOM access and render.js/main.js are thin glue. Minor shadow data: the key bindings are restated as data-key attributes and hint text in index.html, duplicating the mapping in src/controls.js, and render.js hardcodes player names and colours (presentation-only, acceptable). No dataset was pinned by the task beyond the two canonical numbers, and both are honoured. Did not run a data-flow probe; verdict based on code reading.

The suite is real and mostly behavioural. The game-rule tests assert concrete values: 100 starting health, a direct hit doing exactly 70 health left, blast damage 30/15/0 at centre/mid/edge, a draw when both tanks fall, and the turn passing after landing. Boundaries are covered: angle and power clamping, a freshly fired shell not hitting its own tank, and a shell leaving the map as a miss. Physics has a range check for a 45-degree shot. Coverage gaps: render.js, main.js and serve.js have no tests at all. The restart/new-duel path in main.js, the R/Enter-only-after-finish rule, and the serve.js path-traversal guard are untested. There is no end-to-end or browser-level test, so the assembled game is only exercised through the screencast the task requires. The AGENTS.md and done note claim 'full coverage' of the logic modules, but no coverage report was delivered to back that up. Several assertions are loose (e.g. the 'near tank' health band 60–100 in game.test.js), which is acceptable but weaker than exact values.

Several unrequested touches are present in the code and look wired. Shift-held coarse nudges with key-repeat (src/controls.js:25-45, src/main.js:27-38). Pointer hold-to-repeat on the on-screen buttons (src/main.js:58-68). Dead tanks turn grey and smoke (src/render.js:drawSmoke). A bobbing turn marker over the active tank (src/render.js:drawTurnMarker). A fading shell trail (src/game.js:recordTrail, src/render.js:drawTrail). Blast debris with ballistic motion (src/game.js:rollDebris, src/render.js:drawBlast). Tanks slide down when the ground under them is blasted away (src/game.js:settleTanks). Draw handling and a R/Enter restart prompt on the win banner (src/render.js:drawBanner). Drifting clouds in the sky. These are well-chosen, end-user-facing touches that look working from the code. I could not see the screencast, so the working state is inferred from the code, not observed. The extras stay well short of a memorable signature feature, so this is not higher.