This is a new Ocarina of Time romhack by DezZival. The basic premise is like the Ganon's Castle trials but more complex. You can find the trailer and download links here: https://www.youtube.com/watch?v=zDNQP-ZsQDY
The download from there is a .ppf file that must be patched onto the OoT master quest dubug rom with PPF-O-Matic.
I thought this hack was pretty cool, some parts were a bit annoying but overall it had some really interesting and unique puzzles.
This hack has a special easter egg ending but I couldn't get it because my game kept crashing, if you want to see it watch it here: https://youtu.be/R1r7klXmVyc?t=15037