Custom game file used by Enigmo 2, an outer space puzzle game; contains one or more game levels, including walls, locations of obstacles, dynamic puzzle parts, player parts, and solution conditions; used for storing custom puzzles as well as downloading new puzzles from the Internet.

When saving from a custom game, the resulting file stores all of the custom game data, allowing the custom puzzle to be played even if the E2GM file is deleted. Custom games can be created by selecting Edit Custom Game → Create New from the Enigmo 2 main menu.