W / up arrow:climb up or jump: E:open doors / talk: SPACE:jump: I:open inventory: SHIFT:walk: D / right arrow:move right: jump:space: fire:left mouse: 3:change to melee weapon: 1:change to primary weapon: 4:change to explosive: Escape:open option screen: A / left arrow:move left: 2:change to secondary weapon: R:reload: S / down arrow:climb down: movement:wasd:
Use A,D or left, right arrow to move around mouse to shoot space/W/up arrow to jump E to talk or to open doors W,S or up,down arrow to climb up and down the ladder I to open inventory hold shift to walk Escape to open option screen R to reload 1,2,3,4 to change weapon