FPS Games Without Hack Detectors..?

First off, please dont call me a noob or hacker. This is for educational purposes only.

Im starting college in fall for game development but at the moment im in a tech school learning coding and gaming and all. We just finished learning how to make trainers.

I was gona try it on crossfire but whenever i open up my software crossfire closes down.

its not really hacks, its just cheats like in video games (unlmt ammo/health is what i wanna test)

But dont flame and just tell me a game i could test out..?