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:
A playing field with 9 squares. The first player to get 3 in a row wins.
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.
This mode is available for both game modes. In the forget mode previously placed crosses on circles disappear over time.