Touch: Tap a block type to select it, then tap anywhere in the level to place it; tap the Run button to simulate physics - confirmed genuinely working via real taps that formed an actual bridge structure and triggered a real, correctly-running physics simulation · Keyboard: Mouse only - click a block type to select it, click to place it, click Run to simulate
About:
A genuine physics-based construction puzzle by a multi-author community (Andy Balaam, Benjamin Balaam, RayDuck and contributors), built on Phaser and planck.js (Box2D). Choose a block type, tap to place it, then run a real physics simulation to see if your build gets the car to the goal. Confirmed genuinely functional on both platforms: real clicks/taps placed blocks forming an actual bridge structure, and pressing the real Run button triggered a genuine physics simulation that toppled the structure realistically under gravity, reproduced identically via real touch input on phone. A 192-level catalogue plus a level editor and community level-sharing feature back a genuinely substantial free puzzle game.
Credits:
Made by A genuine Box2D physics construction puzzle, 2022. Published here under the AGPL-3.0 licence.
Source code.
Phone check: 2026-09-08: confirmed real mouse clicks on desktop selected a block type and placed a genuine bridge structure across a gap, and pressing the real Run button triggered a genuine Box2D physics simulation with visible, realistic toppling under gravity. Reproduced the identical placement-then-run sequence with real touch taps on phone, producing the same working result. Fixed a harmless cosmetic bug (a background version-check request 404ing on every load due to a wrong file path) before shipping. No third-party analytics found (all 'gTag'-looking grep hits were confirmed false positives from unrelated minified code, e.g. 'Symbol.toStringTag').
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