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In September of 2017 Giesenberg released the hack Super Mario 64 Online, a Windows application that adds an online multiplayer mode to the game.
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Development took over two years and was documented by Giesenberg on his YouTube channel, earning him a significant following. The hack received notable media attention for its advanced gameplay modifcations and overall scale. In 2016 Giesenberg released the Super Mario 64 hack SM64: Last Impact, a total conversion modification that changes story, level geometry, textures and behavior of the original game.
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His hacks were notable for implementing more custom game logic than was previously possible in the scene. To further modify gameplay Giesenberg began modifying the compiled game code in assembly.
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He completed his first hack within two weeks. Giesenberg was inspired to create his own hacks based on Super Mario 64 after discovering existing modifications by fellow game hackers in 2012.
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