Press ~ before or during game play to display the console window. Type remoteadmin 1 to enable remote access, then type Login developer to enable cheat mode. Then, enter one of the following codes at the console window to activate the corresponding cheat function.

Effect - Code
Toggle flight mode - fly <0 or 1>
Toggle God mode - god <0 or 1>
Toggle no clipping - noclip <0 or 1>
Toggle unlimited ammunition - uammo <0 or 1>
All weapons and ammunition - give_all
Display framerate - enable counter
Display crosshair - enable crosshair
Cycle through crosshairs - rotate crosshair
Level select - loadscenario("umc_spscenario1","")