Ex & Oh

In 1952, inside a room-sized computer called EDSAC, one of the first video games ever made woke up: tic-tac-toe. Ex & Oh brings it back as an adventure. SEVEN WORLDS, SEVEN RULES Each world changes one thing about the game you know. • Classic — three in a row, against a machine that learns. • Fifteen — take numbers 1 to 9; three that add to 15 win. • Drop — four columns with gravity. • Wild — place X or O; any line you complete is yours. • Blind — your marks go dark. Play from memory. • Notakto — three boards, only X. Whoever completes the last line loses. • Ultimate — nine boards in one. Your move decides where your opponent plays. A MACHINE THAT HAS SOLVED THE GAME Opponents climb from Novice to EDSAC across ten levels. Where a game is solved, EDSAC plays perfectly — and three stages ask you to beat it anyway, in the variants where the first player can force a win. LEARN FROM EVERY GAME • Move-by-move review against the solved truth shows exactly where the result changed. • Hints when you are stuck. • Observer mode reveals the value of every position. • Three stars per stage: clear the goal, clear it without hints, clear it flawlessly. A NEW PUZZLE EVERY DAY Today's puzzle is free forever, with or without the full game. Keep a streak going. FREE PLAY Any rule, any level — or two players on one phone. FAIR AND QUIET • The first world, Classic free play and the daily puzzle are free. • One purchase unlocks everything else. No ads, no subscription, nothing else to buy. Family Sharing supported. • Works completely offline. No account. No data collected.