Exploits (DX)

General

 * Bring items back to the first mission - Start a new game in the middle of a mission, any items which you were carrying will be with you at the beginning.

physical

 * Grenade climbing
 * Grenade Jump
 * Grenade Fallng
 * Grenade clipping - in other words, "ghost mode" through glass, thin wall...

Muliplayer

 * Speedhack - pick about name "power suit" - allows you to jump to the top maps and too on 2x speeding. if you kill someone at aforementioned actived tools, then afther respawn will run faster!