Room 7: The cells!

First visit
Take the purple gems and the pear. To get the red gem for the door enter the purple door on the right to room six.

Second visit
Push the wooden box on the switches beginning with the lowest one. Wait until the fuzz ball has passed the light door, then, without wasting any move directly follow it, to get the apple/heart and get out again. Push the wooden box off the switch (and directly step off the switch), when you leave a mini room, as the fuzz ball will follow and kill you otherwise.