level 9!!!!
Level 9: Jump over the springs without destroying them, then go to the medium size changer on the left-hand side to shrink your character to medium size. Next, jump on a trampoline to get to the platform on the right-hand side by pressing the up arrow key to jump while on a spring to go higher. Jump on the two platforms without falling to get to the small size changer to shrink your character to small size. Finally, use the springs again and jump to go higher to reach the exit portal.
And remember, springs can be destroyed at large size.