There is one King of D&D puzzles, and his name is Johnathan M. Richards. He wrote all the Challenge of Champions adventures, and Gorgoldand's Gauntlet, and I think a couple others. He's a GENIUS of writing puzzles for D&D. Check out any of those, and you won't be sorry. Some are available free on the net. Like, for example,
here.
There are more than this list, but here is a partial list:
Dungeon #58: Challenge of Champions
Dungeon #69: Challenge of Champions II
Dungeon #80: Challenge of Champions III
Dungeon #91: Challenge of Champions IV
Dungeon #108: Challenge of Champions V
Dungeon #138: Challenge of Champions VI
He also wrote Challenge of the Champions VII, but as far as I know it hasn't been published yet. Maybe for D&D Next?