Cellular Automata

You start with a blank grid and a simple question: what happens when every cell lives or dies based on how many neighbors it has? Draw a pattern with your cursor, hit play, and watch it evolve — collapsing into stillness, looping endlessly, or exploding across the canvas in ways that feel almost biological. The drawing tools let you sketch directly onto the grid, while the rule controls let you swap in different rulesets beyond the classic Game of Life, so the same starting shape can behave completely differently depending on what you feed it.

This sits firmly in the interactive simulation category, where the reward is observation as much as action. There's no score, no timer — just a system you poke at and study. If you want something with a similar emergent quality but more tactile feedback, Flocking Boids is worth a look, where simple rules on moving agents produce surprisingly lifelike crowd behavior.

A larger screen helps here because the full grid takes up significant space — fine details in evolving patterns are much easier to track when cells aren't tiny. Keyboard shortcuts for play/pause make it easy to stop and examine a generation mid-run.