Dangerous Dungeon Delvers. Or Dicechucking Decision Determination. Or 3 Dice 6.
The purest essence of an old-school fantasy RPG.
We all have stacks of books and posts with lists of stuff. Spells, items, monsters, adventures, whatever. But they're buried under piles of rules nobody will ever use. D.D.D. is a trivially easy, gamebook-like, portable game to run all that stuff.