Loose Bolt

Small games for the browser, built on the same idea: the thing that ruins your run is a real physical object with mass, not an animation on a timer. It fails differently depending on how you arrived.

Studio: Loose Bolt
Established: 2026
Platform: Web, free
Engine: Matter.js / Three.js / Canvas 2D
Titles: 4 shipped

Part 01

Rust Route

Live

A flatbed truck halfway across a rope bridge at sunset, the deck sagging under it, a plank missing behind and a chasm below — Fig. 1 — Route 27, mid-span on a rope bridge with two of the planks missing.

A flatbed truck and two pedals. That is the whole vehicle. The truck is a real rigid body, so it tumbles like one: land on the roof and the run is over. Once airborne, those same two buttons stop being throttle and start pitching the truck.

Routes	32, hand-built
Controls	2 buttons
Download	1.4 MB
Failure mode	Roof, chassis, empty tank

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Part 02

Give Way

New

A workman in a red jacket standing on a raised city street at dusk, scaffolding and a flatbed truck behind him, a service pipe running under the road — Fig. 2 — Level 51, The Long Drop. The road here is the last one.

The floor is the enemy. A plank that holds if you walk and snaps if you run. A ledge that tips once your weight passes its hinge. Stairs good for one footfall each. After you die you can always see what would have worked, which is the rule every level is checked against before it ships.

Levels	51, gated
Trap kinds	8
Download	3.0 MB
Jump	Fixed height, no hold

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Part 03

Hotshift

New

A round orange face flying through a narrow white corridor, an orange wall ahead of it and a blue wall below, against deep navy — Fig. 3 — Level 24. The orange wall passes only while you burn; the blue one only while you are cold.

One button does two things at once. Hold it to rise — and to burn hot. Let go to fall — and to go cold. Orange walls let you through only while you burn, blue ones only while you are cold, and going up is what makes you hot. Being high and being cold is therefore a problem, and that problem is the whole game.

Levels	50, in 6 tiers
Controls	1 button
Download	32 KB
Failure mode	Wrong colour, ceiling, floor

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Part 04

Cogwalk

New

Two clockwork robots on a paper grid, one brass and one green, with walls, pale blue ice tiles and a dashed target ring for each — Fig. 4 — One strip of instructions. Both robots obey all of it, at the same time.

Write a program, then press GO. Three instructions — step, turn left, turn right — and every robot runs the whole thing at once. Walking into a wall does nothing at all, so a robot that stalls while the others move is how a puzzle gets solved. Every level was proved solvable by exhaustive search before it shipped, and the shortest possible answer is known for each.

Levels	50, in 6 tiers
Instructions	3
Download	45 KB
Par	Proved, not guessed

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Part 05

Tickover

New

A gold arrow marker part-way across a dark grid, with slate walls, a
red-barred shutter shut and a green one open, each wearing small
counting pips, and a teal target ring in the far corner — Fig. 5 — One button. Everything moves on the beat, including you.

Your piece steps one cell every beat and never stops. Press, and it turns right. Right is the only way it turns, so anything on your left costs a loop the long way round, and the loop costs beats you may not have. Shutters open and close on their own count, which makes timing worth as much as route. A solver ran all fifty levels before release, so the par is the real minimum and the hint cannot lie to you.

Levels	50, in 7 tiers
Controls	One button
Download	50 KB
Speeds	Steady, Brisk, Rapid

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