Sorry I only got to Ronk last time, I accidentally clicked submit too early.
Let's continue where we left off.
Boss 6: Snips
Snips is immune to star spin. All you have to do is
A: Reflect the bombs she throws
B: Let the bombs bounce and wait till they hit her while avoiding them.
Its that simple.
Boss 7: Terrible trio
Ronk, Snips, Papes, all at the same time.
The second battle is harder. Papes will charge at you with his sheild. Get behind him and attack. Repeat
Same as papes, just that he charges in a straight line and not with a shield but a damaging fist.
Beat her the same way as last time. You can also make her bombs hit Papes and Ronk.
Boss 8: Mashtooth first form.
Use your shooting star on Mashtooth once so he hits the wall. Next time he charges hit him with shooting star twice.
When the small lightning comes, get in between them so the big lightning doesn't hurt you.
Next shooting star him twice, and he's done for.
Final boss: Mashtooth Final Form
Attack his face and dodge the lightning bolts. Then, when he throws rocks, Reflect them and do damage. Repeat.
When the lasers and rocks combine, focus more on the rocks because they are more important.
Next you'll have to beat a laser. Simply press Y as fast as you can. Then comes the second laser. Use your best speed for about five-twelve seconds, then pause the game. Allow about 90 seconds of recovery, then do it again.. Repeat.
That is a very handy trick because you end up pushing the laser little by little.
To unlock world 10, beat boss mode under 8 minutes.