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Tic Tac Toe is the smallest perfect-information game you'll ever play, and yet a surprising number of adults still lose to a focused 8-year-old. This version offers two ways to play: pass-and-play with a friend on the same device, or against an AI with three difficulty tiers. Easy makes mistakes on purpose, Medium plays sensibly, and Hard is solved - you cannot win, only draw or lose. That's the whole charm; once you know the trick of taking the center and watching for forks, every round becomes a tiny meditation on how a game can be exhausted by thought. Three rounds take about a minute. Play during a wait, or use it to teach a kid what "strategy" means.