The first piece that goes in is the first piece to come out (FIFO).
Three (3) pieces of each player shrink until they're gone.
Two players alternate their turns and the game is over either when one player wins or when both players agree they cannot win.
This variant of Tic Tac Toe is fun for adults too.
For each player, the placing order of their last 3 pieces is always shown on the board.
There is no hidden info; no memory needed.
Print and play available with this file.
(Cover box for folded board here.)
Try its video game adaptation on PrequelPlay.
Enjoy!