Toroid

Toroid is Conway's Game of Life, the cellular automaton John Conway published in 1970, on a board you can draw with a finger. Four rules run the whole thing. A living cell with two or three living neighbours stays alive. One with fewer dies of loneliness, one with more dies of crowding. An empty square with exactly three living neighbours comes alive. Every cell updates at once, and that is the entire game — there is no score, no goal and no opponent, only what your starting pattern turns into. The board wraps at every edge, which is where the name comes from: the grid is the surface of a torus, so a glider that walks off the right side reappears on the left instead of falling off the world. WHAT YOU CAN DO - Drag a finger across the grid to draw cells, and drag back over them to erase - Play, pause, or advance exactly one generation at a time - Set the speed anywhere from one…