Clock Tower

Walkthrough
Climb down to the bottom of the tower and go down the hall to find four coloured squares. Each of these squares points to a passage that leads to the respective cog. You can only hold one cog at a time. Here is how to get each one:

White -

Take the north-west passage. Grab the rat poison. Ensure both levers are up to open the doors, then enter the rat area. Use it on the food trough. The rats will bang against the far gate, trying to escape. This will cause it to open. Take the white cog, climb up the ladder, exiting by the one-way trap-door north eat of the clock tower, and use it on the white spindle on the top floor.

Blue -

Outside the dungeon, walk to the east. Directly south of the zoo's camel pen, you should see a ladder. While you are here pick up the bucket and fill it at the well. Climb down and follow the long passage until you reach the Dungeon Rat's prison cell. Take the cog, then climb up the (one way) ladder. Use the cog on the blue spindle on the floor one below the top.

You will also pass the other side of the grill where the ogres are and but you can't can telegrab the cogs. So...

Red -

Simply follow the south-east passage until you reach an ogre trio. Take the cog and use it on the red spindle on the main floor.

Black -

If you happen to be wearing ice gloves, simply walk down the north-east passage and pick up the cog. Otherwise you should have the bucket of water from the blue cog. (If not, go outside and walk east to the ladder that you climbed to get the blue cog. Take the bucket, fill it with water, and go back to the dungeon.)  Go down the north-east passage, find the black cog surrounded by flames. Use the bucket of water on the cog to cool it off, then pick it up. Use it on the black peg in the basement.

Reward

 * 1 quest point
 * 500 coins