Perfect Dark is a first-person shooter in which players control Carrington Institute agent Joanna Dark through a series of levels collected together into missions.[1] The general gameplay is similar to that of its predecessor GoldenEye 007, with features such as stealth sections and objectives determined by difficulty settings carried over.[2][3] Players can crouch, duck, lean, and drop from most ledges, but there is no jump ability.[4][5] A number of tutorials and training activities can be taken at the Carrington Institute, which acts as the game's central hub.[2] The Nintendo 64 Expansion Pak is needed to access the game's campaign and most of the multiplayer features, although a limited subset of the Combat Simulator options are available without the device; around 35% of the game is playable without an Expansion Pak, as estimated on the game's box and Instruction Booklet.[6]