What is a MIS file? An MIS file contains mission level data for Marble Blast, a 3D game where the player navigates a marble through a course from start to finish. It may be packaged with the game or a custom level created by a user. MIS files are saved in a text format that can be opened and edited with a text editor, such as Microsoft Notepad or Apple TextEdit.

More Information MIS file open in Microsoft Notepad Marble Blast Mission MIS files are meant to be referenced by the game to load level data, not manually opened. However, some gamers enjoy creating and modifying levels featured in the game and use text editors to modify the properties of the levels. Marble Blast Gold custom level data files are stored in the Marble Blast Gold/​Data/​Missions/​Custom directory along with the associated image file. NOTE: Various versions of Marble Blast use MIS files to store mission level data, including Gold, Ultra, and the Platinum and PlatinumQuest mods.