A card game pitting one player’s Colonial Marines versus the other player’s Aliens.

Each player has a deck of 36 cards equally divided into three suits (Combatants, Weapons, and Tactics). Players attempt to build hands with the greatest combat value. When battles are lost, the cards are discarded to a Casualty Pile.

The game ends when all of a player’s cards are in the Casualty Pile, at which point the other player wins the game.