Ancient Slide 64 is a ROM hack created by Ginson for the SimpleFlips' Slide Hack Competition (2024) ft. PirateSoftware, in which it placed 14th.
Peach's excavation team found a strange entrance to an ancient tunnel system in the mountains. So Mario is tasked to scour the place for a hidden star. Be careful though, you never know what will happen at the center of the cave.