This is the paper-and-pencil classic rebuilt on a polished wooden board, with one twist that keeps it fresh: besides the usual 3x3 grid you can choose 5x5 or 7x7, where you need four marks in a line instead of three. The bigger boards turn a game everyone knows by heart into a real battle of forks and double threats. Play alone against a computer that blocks every careless line, or sit next to a friend and take turns on one screen. If you enjoy calm strategy games, also try Master Chess or Jr Chess.
Click or tap an empty cell to place your mark. On 3x3, get three in a row horizontally, vertically or diagonally; on 5x5 and 7x7, you need four in a row. Grab the centre early, build lines that are open at both ends, and always block your opponent once they have two or three marks lined up. Use the speaker button to turn the sound on or off.
