For cheat activisation do this:
1. Exit to main menu.
2. Move mouse to the top left corner.
3. Press [Alt] + [Ctrl] + [C]. (Cursor animation must stop).
4. On KeyPad (Right side of keyboard) type 3615 & press [Enter] (ON Keypad).
After this animation on cursor must restore. Now you in Cheat mode.
In normal game or 3D press Ctrl-T & you will get all guns, & statistics
will be initiate. Also you will get all mission stuff.
WARNING: Dont press Ctrl-T when you are in 2D mode or when you are swimming.