Overview
Decay Tic-Tac-Toe is a variant of Tic-Tac-Toe where older moves disappear. Traditional draws are impossible.
Board Size
Choose a board size from 3×3 to 6×6. Changing the size resets the game and the score.
Decay Rule
Each player may have at most N active marks, where N is the board size. At the start of a player’s turn, if they already have N marks on the board, their oldest mark is removed before they move.
Winning
A player wins by completing a full row, column, or diagonal.