User blog comment:Akrie/Supreme Treasure Chest 6+1 Big Set Log/@comment-25889587-20150318041142/@comment-25889587-20150318131729

Well, to get to the final three levels, you'll need to dedicate your coins to that treasure. I failed 16 times to upgrade my Rare Sapphire Brooch to +9. It's kind of devastating, since I've collected 1 million from autorun and have to lose that much coins.

And as of now you'll need to practice not hitting on the final stage of both Primeval Jungle and Dragon's Valley. If it wasn't for that extensive last stage training, I wouldn't have got 145M score :P Thankfully, I kind of memorized the pattern in Pineapple Altar, so I know exactly how to avoid them.