Here are videos of each level with locations of each treasure room. Most of the maps are quite large so this should help you find the treasure rooms easier. Credit goes to Tinkster for making the videos. This seems easier then writing out names of rooms with no locations.
Chapter 1 -
Chapter 2 -
Chapter 3 -
Chapter 4 -
Chapter 5 -
Chapter 6 -
Chapter 7 -
Chapter 8 -
Chapter 9 -