"Warhammer 40,000" is a miniature wargame, and Space Marines are one of the many playable factions available to the player. They are the most well-known and popular army, always featuring in the artwork and starter set of each edition of "Warhammer 40,000" and other spin-off games such as "Space Hulk" and "Epic" (excluding the 2nd edition "Titan Legions"), and simpler derivative games such as "Space Crusade". Likewise, they are the most popular protagonists in spin-off fiction such as novels and video games.