Ruthless Tic-Tac-Toe

Tic-tac-toe the way you played it in the margins of a school notebook, three ways, against a computer that's ready when you are, a friend on the same phone, or a friend online. Three games - Classic: three in a row wins. A full board is a cat's game. - Vanishing: you keep three marks. Play a fourth and your oldest rubs out. It shows faded the move before, so you can see it coming. No winner in 30 moves is a draw. - Ultimate: nine small boards in a big one. The square you pick sends the other player to the small board in the same spot. Take three small boards in a row to win. You play zoomed in on one small board, and after each move the board backs out to show where the next player was sent. Play the computer - Easy plays anywhere. Good for warming up, or for younger players. - Medium takes a win when it sees one and blocks yours, but looks no further. In Classic, set up a fork, two threats at once, and it can't stop both. - Unbeatable, in Classic, plays perfectly and never loses. Hold it to a cat's game and you've played a perfect game too. - Hard, in Vanishing and Ultimate, thinks well ahead and is very hard to beat. Two players, one phone - Pass the phone. X and O swap who goes first every game, so it stays fair. Play a friend online - Make a game in any of the three and send your friend its six-character code. They type it in and you're playing. - Take your turns whenever you like: the game waits. Your games lists every game you have going and whose move it is. - See whether your friend has the game open, and play a rematch when a round ends. Who goes first swaps each time. - Online play needs a connection. Everything else works offline. Make it yours - Four looks: Notebook, which follows your phone's light or dark setting, Chalkboard, Napkin and Whiteboard. - Play as X or O, and choose who goes first against the computer. - Hand-drawn marks, pencil sounds, haptics, and stars when you win. Sound can be turned off. - A score tally for every game and level, kept on your phone. Trophies - Nine trophies to earn, from your first win to holding Unbeatable to ten cat's games, and your best win streak against the computer. The small print - No ads, no accounts, no tracking. - Online play keeps an anonymous player id and each game's moves on the game server, only so the two phones can play. Nothing is sold or shared. - A tip jar, if you'd like to say thanks. Tips are optional and unlock nothing: the whole game is already yours.