Welcome to Super CYG Shoshinkai! Basically it's a Super CYG and the SM64 Shoshinkai beta mashup. Use arrow keys to move and jump. Collect the coins. Jump upon Matthews (twice!) to beat them. Here's a walkthrough: https://www.youtube.com/watch?v=9fLNs-TEMkM
Thanks to @TehCoolScratcher for making the Mario apparition sprite and the CY head in the HUD. Version 2's stuck on save-loop so this is all I have.
