this happened to anyone else?
 

There were two games that I used to play a lot. Menace and Giana Sisters. For some reason in both games, you could never be hurt. Giana could walk through the monsters without being killed and in Menace, you could fly through everything without taking any damage.
Does anyone know how this happened to the games? I never typed in any cheat codes. Could someone have modified the disks before I got them?

Some cracked games had trainers turned on if you clicked LMB, pressed the joystick button or hit the space bar to pass the intro, like you would normally.