A tabletop wargame, Warhammer 40000 (or 40K) is set in a futuristic universe populated by fantasy creatures.
Play takes place on a table around four feet wide and four to eight feet long usually with terrain added to create an environment for the armies to battle in. There can be two or more players each with different armies of figures, which have usually been lovingly painted in advance.
Games can last anything from an hour to a number of days as players move their armies around the board and roll dice to find the outcome of battles.