<——— Back to Tic-Tac-Toe Logic Puzzle

The aim of this quiz is to place Xs and Os correctly into each cell on the 3×3 grid, as in a tic-tac-toe game. A player wins when having occupied the entire row, column, or diagonal with the same symbol. Otherwise the game ends in a draw.

Cell 1 tells you three things at the start of the game:

  1. The game ended in a draw.
  2. ‘X’ occupies opposite corners.
  3. No other hints are necessary for solving the puzzle.

Since Cell 1 is a corner and is an ‘O,’ we know that Cell 3 and Cell 7 must both be ‘X.’

Because the game ended in a draw, we can conclude that Cell 5 must be an ‘O’ in order to prevent a tic-tac-toe from occurring with Cells 3 and 7.

Knowing the rules of tic-tac-toe, we can fill in the remaining squares using just logic in order to force a draw.

Cell 9 must be an ‘X to block the tic-tac-toe for 1 and 5.

Cell 6 must be an ‘O’ to block the tic-tac-toe for 3 and 9.

Cell 8 must be an ‘O’ to block the tic-tac-toe for 7 and 9.

Cell 2 must be an ‘X’ to block the tic-tac-toe for 5 and 8.

Cell 4 must be an ‘X’ to block the tic-tac-toe for 5 and 6.

The final layout of the tic-tac-toe board is:

O X X

X O O

X O X

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