Hi!
I decided to ask because I have played it over and over again (same player). I can't find all the gems. I read the posts and found a breakdown by level. Thank you RjX for that, but I am still struggling. At chapter 15, there are supposed to be 5 total. Among them 1 purple in between both trees and 1 blue right side towards the middle of the screen. I can't find them. Are they really there? Should I change player in order to see them there? I would love to finish this one completely for once.
It amazes me that someone can get a score of 1553425!
Thanks.

Yes, they really are there, but I think they move. Try as a different player. Also, try playing at night in a very dark room. That helped me.

Thanks alevy1974.
It's getting dark up here. I'll turn all the lights off and try again under a different name.