30 -< Try to bounce in less ballons as possible, you can outrange the first ballon with a double jump, the first blade jumping over it with the second balloon, and then the middle part of the stage can be overjumped with a double jmp. Then in the lower part just time your fall so you can avoid the spikes but reach the ballons without double jumping. Hope it helps!
For the third challengue just use the tetrimins of the I and the O and you're done.
Inestable towers FTW!
But now i can't get the 99 blocks challengue. Seems easy, but it's not.