I am currently playing Nicolas Lepy - The Manuscript Of The Andes and the enemies in this game are so profuse with high end weapons being non existent, so I was about to trash this at level 3 as med packs were disappearing faster than a fart in a high wind. Then I thought what about these all weapons cheats that I had heard about so I went hunting. Google is your friend. I admit to being dubious as the only cheat I had ever used was the DOZY cheat and that did not work in this level. Well, I found one, tried it and the damn thing worked. Ended up with all weapons, thousands of rounds of ammo and 50 large and 50 small health packs. This is for TR2 levels and I am unclear if this one works in the other TR games. Have you guys heard of these and if so, what other ones are about that work? For those who doubt try this.
I must have cheated like 1% of the times (unless you consider forums and even videos as cheating which is, I think, utterly far fetched).
Anyway, Stella's site is the place to find all cheats and more ever since TR started.