Shallow Pits is a single exit challenge hack I made over the course of a few weeks which takes inspiration from Kaizo:Hard and Pit hacks, however to make it palatable to human players every level is a single-screen room and there are about 50 rooms.
The game is entirely vanilla except for a handful of quality of life patches and minor tweaks, no glitches or bugs from the original game have been fixed, in fact it may exploit them. Your progress is automatically saved at each room when you enter it (even if you reset) so you can take a break without worry.
If you pick up this hack be cautioned that it is designed for a particular taste and makes no bones about being a challenge and having rude trolls that invokes the spirit of the inspiration material.