Regular tic-tac-toe is solved by age eight. Ultimate tic-tac-toe — nine boards, where every move chooses your opponent's battlefield — is deep enough that mathematicians write papers about it. Here's how to actually play it well.
New to it? The full rules are on the game page, where you can play free against a friend, a matched opponent, or the bot. The one-line version: win little boards to claim them, win three claimed boards in a row, and the cell you pick sends your opponent to that board.
The beginner instinct is to grab whatever cell looks best locally. The whole game, though, lives in the rule that your cell choice = your opponent's next board. Before every move, ask two questions in order: "Where does this send them?" and only then "Is this a good cell for me?" A mediocre cell that ships your opponent to a dead-end board beats a great cell that hands them the center.
The middle mini-board sits in four of the eight winning lines of boards — the same reason the center square dominates other line games. Two consequences: fight hardest to claim it, and think twice before playing center cells elsewhere, because every center cell sends your opponent into that precious middle board.
If you send your opponent to a board that's already won, lost, or drawn, they get a free move anywhere — the single most powerful thing in the game. As boards finish, the network of safe destinations shrinks; track which cells now lead to closed boards and treat them as landmines. Conversely, engineering a free move for yourself late in the game is often the winning breakthrough.
Sometimes the right move is playing into a board where you're already beaten. Losing a cell costs you nothing there — the board was gone — but it still sends your opponent somewhere. Deliberately dumping moves into dead boards to control your opponent's destinations is the ultimate-tic-tac-toe version of a tempo move, and it's what separates intermediate players from beginners.
It's easy to win three mini-boards and still lose because they don't line up. From your first claimed board, know which two others complete a line — and notice which boards your opponent needs. Blocking on the macro level (making sure their third board never comes) matters more than any single cell fight.
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Prefer raw pattern warfare? Try gomoku strategy, or go three-dimensional in Tic-Tac-Toucan 3D. All guides are here.