The Tuning Room

Entrance to the chamber:  an iron door.  If the characters spend time examining it, they will note that it becomes very hot to the touch, then 30 seconds later very cold to the touch, then back to hot 30 seconds later, etc.  Listening at the door will also reveal a repeating pattern of five low-frequency musical tones.

Created in OmniGraffle.

Inside the chamber:  The room is 15' wide near the entrance, then there's a 5' bottleneck, and then it expands again on the far side.  The ceiling is high, maybe 40'.  The target treasure is on the far side (see diagram).

Near the entrance on each side is a statue:  one statue of a red dragon, and one of a white dragon, both facing the door.  They seem to leer at the delvers as they enter the room, grinning.  Once every minute, the red dragon statue spews a blistering cone of fire, and the frost dragon blows a biting cone of frost.

Beyond the statues, where the room narrows, a stone slab 4' tall blocks the way.  The slab is hanging from the ceiling, supported by five thick steel cables of varying thickness, starting with the thickest on the left and the thinnest on the right (similar to what one would find under the hood of a piano or on a guitar).  Higher up, out of reach, mechanical hammers strike the steel cables to create the pattern of musical tones.

If the characters look closely, they'll see that the stone slab is already a few inches off the floor, but this doesn't leave enough space for them to crawl through.  Also, the cables are thick enough and grouped together closely enough that characters cannot squeeze between them to climb over the slab.

A stand with the next magical instrument they must collect is clearly visible on the far side.

Solution:  Careful examination of the statues will reveal that the heads are not fixed into place; they can be swiveled around and aimed.  Aiming the red dragon head at the cables will cause them to expand, lowering both the pitch of the musical tones and the slab of stone, not helping the characters at all.  Aiming the white dragon's head at the cables, however, will cause the cables to contract, thereby shortening their length, causing the musical tones to rise in pitch, and raising the slab of stone to a height sufficient to allow the characters to crawl under it.

Another Music Puzzle

The characters will arrive at the edge of a huge pit.  They must get to the far side to retrieve another instrument for their quest.  Eight stone discs, big enough to stand on, float magically in open space over the pit.  Each disc has a number associated with it from one to eight as indicated by diamond-shaped markings.  The markings are configured like the symbols on playing cards, while the discs are arranged in a pattern relative to each other as shown in the diagram to the right.

The characters will be able to hear a simple, repeating melody playing overhead.  The melody will correspond to the root notes of a standard jazz progression:

I  vi  ii  V  I   (1, 6, 2, 5, 1, or  C, A, D, G, C)

This is the order that the characters will have to tread the discs in order to get to the other side.  Stepping on any of the discs out of order will dump the character into the pit below.  The minimum weight to activate a disc is 50 lbs, so the players won't be able to easily test them. The distances between the discs will be such that the PCs can jump from side to side (e.g., from  #3 to #2), or from one row to the next (e.g., from #2 to #4), or even diagonally to the next row (e.g., from #2 to #7), but they won't be able to skip rows (e.g., from #2 to #8).

You may have noticed that they will not be able to make it back to disc 1 from disc 5.  The players will need to make the connection that #8 can serve as a substitute to #1, just as the 8th note of a major scale is the same note as the 1st note in the scale, just an octave higher.  So the true pattern is 1, 6, 2, 5, 8.

This will not be an easy puzzle for them.  The pit won't be save or die, of course, but I will put something creepy down in the bottom - and a way to get back up on the near side - to add to the excitement.