backspace + S "slow motion" mode
backspace + U all floors accessible
6 + 7 collect all treasures
backspace + E end mission (instant win)
backspace + I free items
backspace + G god mode and infinite weapon energy
backspace + Q immediately quit game
backspace + D invisible mode
7 + 8 kill all enemies
6 + 8 kill all enemies, collect all treasures, and get all points (unless you killed an informant)
backspace + W level select
backspace + H lose health
backspace + M memory information
backspace + C object count
backspace + P pauses the game
backspace + O show secret walls on map (as flashing white dots)
backspace + A shows all NPCs on map (as red dots)