Tree Tops is actually quite simple if you pay attention to the location of speedways and ramps, after that you just have to know how to time jumps properly. Misty Bog is a pain because of the attack frogs, but again - not too difficult - if one is about to attack you just shift the screen so you can't see the frog and it won't attack you. The hardest level in Spyro the Dragon has to be Haunted Towers, Lofty Castle, or Dark Passage if you ask me.