Spherical - the trainer added keyboard shortcuts that could not be disabled and that overwrote the in game keys. Most importantly the "Retry level" key was overwritten. I think it was F1 or F10 something like that. That key was very important in this game. Without the retry key, the game was pretty much ruined, since a small mistake could mean you had to quit the whole game. So basically the trainer permanently patched the game and made it impossible to play it as intended.
Made me buy that awesome game though