I ran Gorgoldand's Gauntlet at the local meetup, with changes here (I simplified the Spriggan Mirror door compared to the book of challenges version).
It went over like a house on fire!
The Spriggan mirror and Pathfinder goblins were also a hit, and the 4-riddle door wrapped the whole thing together. Players ended up negotiating with the goblins ("We fight the ogre, you guys shoot it with blowdarts, and you can eat it and we just get to see the next stuff") after it became clear the goblins were capable of holding the fort. They also took a goblin prisoner in the trade, he was fun to play (he kept yelling the "change" word in front of the mirror, then the others were yelling it too to counter him, it got silly and confusing, and then they heard the other goblins tunnelling towards so they broke the mirror).
For the minesweeper puzzle, I used notes on the scale (do=1, re=2, mi=3) instead of numbers of chimes, and they ALMOST got it but ended up bruce forcing it. Chatting about it after, the players thought the chimes were a better idea because then they'd be looking at numbers and not as much trying to create patterns from the music.
Although there were only 3 PCs, this is the first time I've run it and not had a chance to shave anyone bald. Excellent module
