Game trainers are often used to enable players to cheat in single-player games, or to gain an advantage in multiplayer games. Game mods are often created by fans of the game and are usually available for download for free.Ī game trainer, on the other hand, is a software program that modifies the behavior of a video game, typically by adding cheats or altering the way the game is played. Mods can range from small changes and tweaks to the game's mechanics or gameplay, to large-scale modifications that add entirely new content or features to the game. A game mod, short for 'modification,' is a modification or alteration to a video game that changes the game in some way.