Serious Sam II cheats and cheat codes for PC

Cheat mode:
While playing the game hit ~ (tilde) to bring up the console window, then 
type "sam_iEnableCheats=1" to activate cheat mode. This code is case-sensitive.

Hit ~ again to close the console, then press [Esc] to go back to the main menu, 
then press [F1] to bring up the pause menu. Here you can select the following 
cheat options: 

Add Life
Ghost
Turbo
Toggle Hud
Chapter 
Unlock Levels
God Mode
Invisibility
Refresh Heath
Kill All

If you want to use the developer cheats use the following case-sensitive code:
sam_iEnableCheats=2 

To disable the cheats use the following case-sensitive code: 
sam_iEnableCheats=0 

Alternate Cheat mode:
Go to the main menu hold [Left Shift], then press F3, F4, F3, F3, F4.
Then, hit F1 to bring up the cheat menu. If you hit F2 while playing 
you will jump to the next stage. 

Debug mode:
Note: Always make a backup copy before edit a game file. Locate the "sam2.ini" 
file in the "/serious sam 2/content/serioussam2/" folder. Open with a text 
editor and find the "sam_iEnableCheats = 1/0" line and change its value 
to "sam_iEnableCheats = 2". Save the sam2.ini file, then run the game.
During the game play, press one of the following key combination:

Effect - Key 
Fly mode - Press L 
Enable God mode - Press G 
Auto aim - Press U 
Get bonus life - Press INSERT  
Modify Real time factor - Press [ and ]
Change chapters - Press Page Up and Page Down  
Kill every enemies on the screen - Press K 
Turbo running - Press J 
Activate invisibile mode - Press I 
Activate no clipping mode - Press Y 

Demo version cheat mode:
While playing the demo hit ~ (tilde) to bring up the console window, then 
type "sam_iEnableCheats=1" to activate cheat mode. This code is case-sensitive.

Hit ~ again to close the console, then press [Esc] to go back to the main menu, 
then press [F1] to bring up the pause menu. Here you can select the following 
cheat options: You can now select the cheat options. 

Lava stage: Armor puzzle:
Before you pick up the mini-gun, enter to the door on your right side. 
You will see an armor on the other side. 

You must to step on the correct letters in order:
S, E, R, I, O, U, S.