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stevebiks posted at 6/15/2009 9:12 PM "i beat the game, then I beat bolivia redux on time trials mode and unlocked the one hit kill cheat....and it shows up in the list... but my question is: when in the game do i enter it? and how do i know its turned on? is there any text or a sound that plays once you have entered the code correctly??"
I just tried it on my PS2 while playing a level. There's no indication that the code is entered successfully, unless the cheat gives a visual result itself. Excalibur and Soul Reaver are obvious. The other weapon cheats show in the weapon Lara's carrying on her back.
Dying, or maybe just reloading, resets the cheats. You'll have to enter them again.