XO

XO — a tic-tac-toe app with four ways to break the classic game: Tricky (unbeatable AI), Wide (4×4), Brutal (5×5, four-in-a-row), and an optional Endless mode where each player's oldest mark vanishes once they place too many, so the board can never fill up. Play solo against the AI or pass-and-play with a friend, with streaks, per-tier win stats, and a few settings (board tint, who moves first, sound/haptics) to make it yours.