There is a tradition amongst computer game aficionados which may be little known to people accustomed to proprietary games. This activity is called mod’ing—making small changes to a game to customize the play experience. Without a game’s source code, such changes are extremely difficult to implement. Games licensed as free software, on the other hand, are quite amenable to mods. This article presents two example mods for single-player games and proceeds to discuss mod’ing in general.
It may be news to you that it is usually easy to tinker with the source code for games