Atari Go

The friendliest doorway into Go (also called First Capture Go or Capture Go), you (black) versus the CPU (white). Stones sit on the intersections of a 7×7 grid. A connected group's liberties are its empty orthogonal neighbours; a group with zero liberties is captured and removed. Forget territory and scoring — here the first player to capture any enemy stone wins, instantly. Surround the enemy, drive a group into atari (one liberty left, ringed red), then take it — all while never walking your own group into a trap. Quick, sharp, and genuinely deep.