Rattle Battle
Jump low across the first pit right of the [O] opening (also the
first pit left of the continue barrel). Aim for the window that
has a banana visible in it.
Above the entry to the room with the Rattly (the snake) barrel.
From the entry point, move to the extreme left edge and jump upwards
to land in an invisible barrel.
Fall into the opening in the ship that's left of the [O], walk
to the left.
Use Rattly's super-high "A"-jump straight up at the
arrow of bananas that's immediately left of the blue Kaboings
(a short distance past the continue barrel).