There's an old Tabletop RPG board game called "Hero Quest". Basically lets you create your own levels but it has a regular campaign mode included in the manual as well for people to play. While you can customize the stats however you like in your own levels, the campaign levels made every single monster, including bosses, only have 1 health point. Depending on what class you picked for your characters, you'd have 8/7/6/4 health points. Honestly, it all made the game too easy; I actually customized the bosses to have more health points and did the same with a few of the special enemies too, specifically for that reason. Then again, I usually always run these sorts of systems using my own rules rather than following procedure (when I sometimes work with Tabletop RPG ideas that is).

I've got pretty much no experience with D&D itself, so I'll leave my comments at that.