Game Trainers are programs made to hook into and modify the memory of a computer game thereby modifying its behavior using addresses and values, in order to allow cheating, unlocking hidden game modes or help with the modification of a game. It can "freeze" a memory address disallowing the game from lowering or changing the information stored at that memory address (e.g. health meter, ammo counter, etc.) or manipulate the data at the memory addresses specified to suit the needs of the user.
The following is a Selection of notable Trainers: