Game of Life — free browser game

The Game of Life, designed by John Conway in 1970, is a "game" with no player — you only set up the initial condition, and the rules do the rest. Each cell is either alive or dead; every generation is updated simultaneously by four rules: a live cell with 2 or 3 live neighbours survives (the remaining live cells die — from loneliness or overcrowding); a dead cell with exactly 3 live neighbours is born. The neighbourhood is in 8 directions (the Moore neighbourhood). In this version the edges of the grid wrap around like a torus — a glider that exits on the right re-enters on the left. Click or drag on the board: the first cell you touch flips its state (alive→dead or vice versa); as you hold the finger/mouse down and drag, it keeps painting that same state. Space starts and pauses the simulation; the N key advances one generation while paused; C clears the board; R fills it with cells at a random 25% density; P places one of the preset patterns (Glider, Blinker, Beacon, Pulsar, lightweight spaceship) on the board in turn. The speed slider on the right adjusts the number of generations per second (1-30). The HUD shows the generation count and the live-cell count. Tip: small patterns can be surprisingly long-lived — for example the R-pentomino is just 5 cells but evolves for 1103 generations; experiment with your own openings.