In the grim darkness of the far future, there is only war.
Warhammer 40,000 is a detailed futuristic table-top battle simulation. Players pick different races or factions and engage in combat over large, varied terrain boards. The game is complex and highly configurable - players choose their armies and the individual units of those armies from a wide selection, choose the squadron composition, upgrades and weapons for their troops, design and build their own terrain, and select the specific objectives of any given battle.
Warhammer 40,000 is also a complete mythos in its own right. The back-story to the game is codified in a series of rulebooks, novels and magazine articles. It is extremely detailed, and is constantly evolving. A great deal of emphasis is also placed on the construction and painting of the high quality figures used in the game; for many players, the collecting, painting and personalisation aspects of the hobby are equal to or more important than the game itself.