LO-FI TIC TAC TOE!
Level 0 vs. a 5-year old.
Level 1 vs. your drunk friend Joe who just yelled "I can kick anyone's ass at Tic Tac Toe" at the bar.
Level 2 vs. Joe the next weekend, after he went home and googled "how to win at Tic Tac Toe."
Level 3 vs. Zee Prime, a glowing human-like entity from the future who has never lost a game.