Ultimate Ultimate Ultimate Tic-Tac-Toe

A game inside a game inside a game inside a game.

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Board in viewPreparing the scale maps…

Fig. 1. Two small scale maps locate one readable Ultimate board within a position of 6,561 ordinary squares.

How the levels answer back

  1. 1

    At the nearest scale, win a familiar small board with three marks in a line.

  2. 2

    Each line settles the board one scale above it. Four nested scales make the greatest victory.

  3. 3

    After an ordinary move, play remains in the same larger branch; the final cell identifies the next nearest board.

  4. 4

    Each newly settled board carries the destination outward by one scale. Consecutive wins on one move can therefore propagate through several levels.

  5. 5

    If an exact destination is already settled, the restriction relaxes outward until an open branch is available.

A board for two

Begin a private game

You will play X. A six-digit PIN admits one friend as O; the whole 6,561-square position remains private to your table.

Take your place

Join a friend

Enter the PIN from your invitation. This browser will remember which mark is yours.