Press ~ to get the console window up, then enter these codes:

Code	Effect
drawpaths 1	Draw/show paths
drawpaths 0	Draw/show paths off
god 1	God Mode
god 0	God mode off
drawkilledcount 0	Hide kill number
drawkilledcount 1	Shows Kill Number
invisible [0 or 1]	Toggles AI on or off
fullstamina 1	Unlimited Stamina
fullstamina 0	Unlimited stamina off