Games / Entropy Sandbox
Draw matter.
Watch rules collide.
Pour materials into a private local chamber, combine reactions, and follow optional experiments. This is a playful simulation—not a scientific model—and every world stays on this device unless you export it.
Ready. The simulation starts only after you choose Start sandbox.
Local field · tick 0
Reaction chamber
Worker-local / silent
Start with sand.
Nothing runs or loads remotely. Start the local worker, then paint the chamber.
Pointer: use the selected tool. Keyboard: arrows move, Space applies, Enter anchors shapes or toggles pen, Escape cancels, B/L/X/G/I/H choose tools, brackets resize, −/+ zoom, Home fits.
Device-local / six slots
World gallery
Autosave resumes the latest chamber. Manual snapshots and exported files stay under your control.
No manual snapshots yet. Autosave remains separate.
Nothing leaves this browser. Worlds, names, experiments, and imports are never sent or placed in a URL.