Toxic Tower
It's a short distance above [K] near the right-hand wall. After
the "A" of bananas (and using Rattly's "A"-jump
to move up to the next level), head across the small platforms
to the right. When you see a single Zinger between two of the
platforms, drop down to kill him and fall to the right.
When becoming Squitter, head up and right. Where there is a single
hornet in the wall, kill him and walk through the wall.