Bowser's Castle Slide: Redemption Run is a ROM hack made by LowPolySM64 for the SimpleFlips' Slide Hack Competition (2024) ft. PirateSoftware, in which it placed 42nd.
If you wanted to learn more about upwarps in SM64, this is the level for you. All wrapped up in a Slide level based on a Mario Kart course. Like any Mario Kart course, there is 3 Laps with different obstacles to navigate and different upwarps to learn in order to progress laps. There is even bonus content after you beat the course in the time limit.