Playable Game Sandbox Directory

The monotonic-snake puzzle that turns a 4×4 grid into an entropy problem. Hold one corner, keep a strict value gradient, and the 4096 tile stops being luck.

A live A* / Dijkstra testbed. Block a corridor and watch the replanning cost change before your eyes.

Cluster-clearing that rewards scanning a whole board before touching it. One complete board is a Deep Focus session; five is a habit.

Colour sorting with a hard capacity constraint. Every pour either opens a reserve tube or buries a colour you will need later.

Cluster matching with gravity-after-deletion. The trap is that clearing a big group can strand the piece you needed.

A release-meter shot with real projectile arcs. The interesting part is the tolerance window: how late you can fire before the arc stops forgiving you.

Hold-to-charge jumping with a genuinely variable jump curve. Small changes in launch duration produce very different apex heights.

A touch-first parking sim. Useful for feeling exactly where finger occlusion and target size start costing you precision.

Keyboard-driven reverse parking with a rear-axle pivot you cannot ignore. Geometry, not reflexes, decides most tight-bay attempts.

Vertical bullet-hell micro-dodging where only the cockpit hitbox registers. Two-minute runs, peripheral scanning, instant reset.

The three-minute decompression loop. Low stakes, high legibility, and a clean stopping point between work tasks.

A bullet-heavy Canvas 2D shooter used here as a frame-budget probe: watch particles, sprites and collision checks compete for the same 16.6 ms.

A WebAssembly build with a visible compile cost on first load. Compare the one-time module instantiation with the smooth loop that follows.

A Web Audio timing demo you can hear. Compare an immediate tap with a late one and the latency budget stops being abstract.