Tic-tac-toe

Tic-tac-toe, also called tick tack toe, or noughts and crosses/Xs and Os as it is known in the United Kingdom, Australia and New Zealand, is a pencil-and-paper game of unknown origin. Two players, X and O, take turns marking the spaces in a 3×3 grid. The X player usually goes first. The player who succeeds in placing three respective marks in a horizontal, vertical, or diagonal row wins the game. If the board fills up before anyone accomplishes this (which is very likely to happen between players with any experience), the game is a draw.

The first video game, OXO, is pretty much this in video game form. It was the basis for Tic Tac Dough and The Hollywood Squares, as well as the Secret "X" game on The Price Is Right.

Tropes used for this game:

 * Casual Game
 * House Rules: Once the 3x3 grid gets too easy, players may trade up to a larger grid size. There's also a "3D" variant, played simultaneously on three separate grids (to simulate a cube), where getting three in a row in any direction (even across different grids) counts as a win.
 * X typically goes first, but that's up to preference really.
 * Match Three Game: Well, you need to get three X's or O's in a row, column or diagonal to win...
 * Player Versus Player
 * Strategy Game: One needs some strategy to avoid defeat in this game, as players are technically attacking and defending at the same time.
 * Unwinnable: If two skilled players play the game, they will inevitably force themselves into a draw
 * Video Game: Ur Example. OXO, a 1952 version made for the computer, is believed to be the first computer/video game to use a digital graphics display.

Notable appearances:

 * Tic Tac Dough
 * The Hollywood Squares
 * War Games