Nim

Nim is a simple strategy game.

Two players (or one player against the CPU) take turns removing one or more tokens from rows.
Up to an entire row can be taken in a single move. You cannot remove from two rows in the same turn.

The winner is determined by who takes the last token.
You can customize the starting conditions, and whether the last move is the winner or loser.

Inspired by a 1978 TRS-80 game.