Aftermotion

A grid puzzle game built from Aftermotion_Mechanics_Specification_v0.1.md. Static HTML/CSS/JS, no build step, so it runs on GitHub Pages.

Core idea: your accepted moves are grouped into batches. Each echo copies only the first direction of every batch (Trace: batch 4, Flicker: batch 2). Plates, doors, push blocks, temporary blocks, helpers, a telegraphed Blocker enemy, Favour/cooldown, a bounded Hop and an Oracle preview combine across 10 levels.

Play

Open index.html, or enable Settings → Pages → Deploy from a branch (root) or GitHub Actions (a workflow is included). Controls: arrows/WASD move, Z undo, R restart, F favour, H hop (then click a tile), O oracle, M levels. Touch D-pad on mobile.

Layout

• js/engine.js: deterministic simulation (spec §3, §5–§8, §9, §12, §14). No DOM, no RNG; timers count accepted player actions.
• js/levels.js: data-driven levels (legend in the file header).
• js/main.js, css/style.css: UI only; reads state, sends commands.
• tools/: node tools/test.js runs spec §19 acceptance tests and a BFS solver proving every level is solvable (tools/solve.js).

Not yet implemented (later systems per spec)

Gambit/Oracle-as-echo, Saboteur/Pursuer/Trickster, toggle/timed/inversion plates, real-time timer mode, rewards/upgrades persistence beyond best scores.