Down We Go is a single page OSR dungeon crawler.
It's got lovely art and layout, and the font choices feel whispery but readable.
Mechanics-wise, your default roll is a d20, trying to hit a DC 15. You add your level in your most relevant class to your roll, and this is where the system gets interesting. There are four classes, Holy, Sneaky, Bloodthirsty, and Mystical, and you can freely assign your levels to any of them. In addition to boosting your rolls, each class comes with a set of level/day abilities. And your highest levelled class determines your hit points.
Combat in Down We Go uses the same dice system, with effectively a coin flip to determine which side goes first. Damage is typically 1/hit, and HP totals are low across the board.
All of this makes for an extremely tight, quick system that still retains flexibility and crunch, but the real standout is the game's optional rule: if you drop a die on the floor, you die.
This optional rule catapults Down We Go from a solid single-page dungeon crawler to a game with a complicated meta about maneuvering people into rolling near the table's edge.
Overall, I'd strongly recommend this. It's a satisfying engine. It's great for pick-up-and-play. And it's got a strong sense of character. It's genuinely fun.