Mushroom Kingdom Fusion (also known as MKFusion and MKF) is a fan game with modified Mario gameplay, crossed over with many different video game universes and elements. This fangame began as a solo project by JudgeSpear, under the name Super Mario Fusion, on December 19, 2007. It is made in Game Maker 7 Pro. The game is based on the Super Mario Bros. Hello Engine 3 by Hello, heavily modified to meet the requirements of the game and to fix bugs.
After the release of v0.1 Beta RC2, several talented people offered their help to JudgeSpear, forming the Fusion Team. JudgeSpear stepped down as a core dev member and has started on Super Mario Fusion, but will continue to contribute to the project.