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Conway's cellular automaton with a library of known patterns, still the clearest demonstration that rules alone make worlds.
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Game of Life sits in Sandboxes & Simulators under Play, and we have it filed as instant — good within five seconds of loading. It reads as mesmerising and brainy.
Physics toys, ecosystems and falling-sand games with no win condition. Set the initial state, then find out what the rules do with it.
Drop an asteroid of your chosen size on any address and read back the fireball, wind speed and earthquake radius it makes.
Design a creature from joints and muscles, then watch a genetic algorithm spend hundreds of generations teaching it to limp.
Build a machine from wheels and rods to push a ball into a zone, and accept that it will topple over the first nine times.
A free flight simulator in the browser using satellite terrain for the entire planet, with real air traffic overhead.
Combine two things to make a third, forever, until you have coaxed a language model into inventing something absurd.
Start with four elements and work towards seven hundred, most of which are jokes you only understand on arrival.
A cabinet of small physics experiments — cloth, water, ragdolls, particles — built by one developer who simply kept going.
A sealed glass sphere of water, sand and brine shrimp that you seed and then leave running, ecosystem permitting.