Space Hulk is a strategy game based on the 1989 board game of the same name, set in the Warhammer 40,000 universe. In contrast to previous games, this product aims for an exact conversion of the original Sins of Damnation campaign. The campaign consists of twelve not interconnected missions (plus three tutorials) where a Space Marine squad fights against aliens, their only enemy type.
The gameplay is turn-based: in each round, every marine has four action points which can be used for actions like moving, attacking or turning. More costly are overwatch and guard, which improve defense in melee combat. The player also has a few general action points on easier difficulty levels, which can be used for any soldier. Different types of soldiers have different weaponry, with advantages and disadvantages. However, the aliens are completely melee-based, relying on dice rolls for combat outcomes.