I'm having problems with getting the four cheat codes that I enter to work. I'm on my PC. After I enter the codes and resume playing my game, it shows that none of the four are working. Can someone help me with getting them to activate? I would appreciate any help I can get for this. Thanks

hey im having problem in the mission deep red i
need to get those tribesmen back to the village
but i can't get them past the pond so i dont know what to do

chivarocks, dont go back through the pond, keep walking after u find the tribesmen, then u will be in a stampede... run through the stampede and shoot only when u HAVE to...