I've got 89 stars now and I've just spent hours trying to complete the daredevil comet for Melty Molten Galaxy!! WOW completing that stage with just 1 health was tough .... all that lava!!!! I think the final bowser stage was also really tricky, avoiding all those giant bullets. I think I probably completed it through sheer luck, not skill - I'm dreading having to replay through it after I complete the purple coin stages now. What do you guys think is the hardest stage?