Hello Mario Engine v6.1.5 Source
GMZ project for GameMaker: Studio 1.4. Make sure your copy of GameMaker: Studio is up to date before importing. Otherwise, you will experience problems.
Hello Mario Engine v6.1.5 Preview
EXE preview for Windows. Showcases the various features included in the Hello Mario Engine. Compiled with the YoYoCompiler for maximum performance.
Hello Mario Engine Legacy
GMK source for GameMaker 8.x. The legacy version is inferior to the Studio version, is no longer being updated, and requires the paid version of GameMaker 8.x. If you want the optimal Hello Mario Engine experience, or a version that can be used for free, use the Studio version instead.