I believe the puzzle in Enter the Kobold, the one you dislike, is the one where you have to light all of the floor tiles to lower the barrier so you can move on. The only problem is that all the floor tiles are sealed off in individle barrier walled rooms. On the ground is a set of crystals that teleport you to another section of the room. Well if this is the "PUZZLE" you hate, then you never really look at how you move through the room. It is simple based on how a knight moves across the chessboard. Which means it really isn't a puzzle at all but a test of player's intelligence.
As pointed out, there are plenty of other options for you to take to reach 20th level. Do not impose your wants onto everyone else. Just because you don't like quests with solve this "puzzle" to move forward, doesn't mean everyone agrues with we. Besides that, finishing that quest helps to unlock the way for you to get DT armor, and that should not be easy.