About Notakto

Notakto is a free online version of multi-board misère tic-tac-toe, invented by Bob Koca in 2010, where both players place only X across two or three boards and completing the three-in-a-row on the last live board loses.

The default game is three-board tic-tac-toe with you moving first, which is the winning seat against perfect play.

The rules in brief

Both players place the same mark, an X, taking turns on any empty cell of any live board.
Three in a row kills that board. That's allowed while other boards are still live.
Complete the three-in-a-row on the last live board and you lose. A draw is impossible.

Learn more

What is Notakto?
How to win at Notakto
Notakto is secretly Nim
Is Notakto solved?
All guides →

Invented in 2010 by Bob Koca · play only X across 2–3 boards · a disguised game of Nim · the 3×3 game has an order-18 misère quotient (Plambeck & Whitehead, 2013)

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