Ultimate tic-tac-toe

Ultimate tic-tac-toe is the the ultimate 3-in-a-row game. The game is made by Tigerish Games and can be downloaded for free on Steam. The game can be played single player, multiplayer and co-op. Ultimate Tic-Tac-Toe has Steam achievements and Steam leaderboards.

Ultimate Tic-Tac-Toe has multiple game types:

Standard tic-tac-toe
A playing field with 9 squares. The first player to get 3 in a row wins.

Ultimate tic-tac-toe
A playing field with 9 large boxes containing 9 smaller pockets where individual games are played. The first player with three large crosses or circles in a row wins.

Forget
This mode is available for both game modes. In the forget mode previously placed crosses on circles disappear over time.