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Mobility Engine is a project file which introduces advanced functionality to GameMaker Studio. The engine is designed to solve a variety of display problems commonly seen in mobile HTML5 games, such as orientation changes, obstructive browser interfaces, scaling, and centering.

These display issues are individually not difficult to address, however when combined they can cause quite a headache, especially for developers with limited knowledge of JavaScript.

When the player turns their mobile device to the side, GameMaker Studio does not account for the orientation change. This can be problematic if the player initially starts your game with their device incorrectly orientated. It also makes your game look unprofessional. Mobility Engine automatically addresses this issue by displaying a configurable graphic when the device is incorrectly orientated.

More Information: http://www.truevalhalla.com/blog/mobility-engine/