four oh four
A free platformer game — play it in your browser, no install. A puzzle-platformer played entirely in your browser's address bar and Back button — built for the BTT Web Game Jam 2026.
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Controls: ← / → or A / D to move · Click canvas, or any key: wakes audio + starts the game
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Open the live demo Source on GitHub⚔ This or That: Platformer games
From the README
A puzzle-platformer played entirely inside your browser's address bar and Back button. Built for the BTT Web Game Jam — Summer 2026 on Devpost.
inventory live in window.location.hash, in plain sight, editable by hand.
echo of your past self behind — sometimes the only way through.
Every run regenerates the secret key and the room geometry itself — the wall, the plate, the doors all sit somewhere new. There is nothing to memorise. Replay it ten times and you solve the same mechanic ten different puzzles.
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