Tin

Tin is one of Chang's sons, found in The Rumpus Room. He is placed just behind a couple of Mice, found in a little hole near the door to the basement.

How to Rescue
The Mice will explain that rats have invaded their home. Run down to the bottom floorboards and wipe out the 15 rats. Then, return to the Mice, and they will let you rescue Tin.

Note that if you are playing on Viggo's Revenge, you will be warped back to the Mice automatically after clearing out the rats.