Hexplode

Hexplode is a strategy board game, according to the author based on an original concept by Janet Ansell. The game works similarly to the outbreaks in Pandemic: You add counters to the hexagon tiles on the board, and when the tile reaches its limit (defined as its "number of neighbors") it explodes, placing a counter on each tile around it, potentially causing chain reactions. The object is to eliminate the other player's counters. You can play a two player game or against the CPU, or just watch the CPU play if you want.