Classic Tic-Tac-Toe. Get three in a row to win. Simple rules, but can you beat a perfect opponent?

Inverted rules: three in a row LOSES. Everything you know is wrong. Avoid the line at all costs.

Superposition moves exist in two places at once. Entanglement collapses reality. Nothing is certain.

Secret goals: WIN, LOSE, or DRAW. Neither player knows the other's objective. Trust nothing.

Asymmetric battle. Order builds lines. Chaos prevents them. Both can place X or O. Who are you?

Complete E-Y-E sequences to score. Each score grants another turn. Momentum is everything.

Connect-Four style. Pieces fall to the bottom. Build your lines while they stack against you.

Both players use X. Complete a line and that board dies. Last to kill a board loses.

Ultimate Tic-Tac-Toe. 9 boards within boards. Your move dictates where they must play next.