Serious Sam II

Cheats:
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Submitted by: Haspa

Start game as usual, open up the console with ~ key and enter the 
command below (CaSe SeNsItIvE): 

sam_iEnableCheats=1 

Once enabled, close the console (press ~ again) and bring up the 
mainmenu by pressing the ESCAPE key - now you can enable the basic 
cheatmenu by pressing F1. Repeat as often as needed just remember you 
have to be in the mainmenu (ESC) to trigger the cheatmenu with F1. 

If you want to use the developer cheats simply use the following 
command instead: 

sam_iEnableCheats=2 

You can also Disable the cheats with: 

sam_iEnableCheats=0