Donut Plains 1: Take a Yoshi (unless you complete the green switch palace) and a Cape Feather. Go near the end of course and fly up the row of green blocks.

Donut Plains 2: Proceed until you see a short pipe. Go up the pipe (as big Mario) and break the blocks. Get the shell, throw it at the highest block, and climb the vine.

Vanilla Dome 1: Take a Yoshi (unless you hit the red switch) and Cape. Get to the red blocks and jump. While in the air, jump off Yoshi and aim for the yellow block. (Repeat aiming for the top of the block.) Climb the vine.

Vanilla Dome 2: Go on top of the second block that normally has a flower. Jump onto the high platform. Grab and carry the P-switch to the block barrier. Stomp on it and go down the hole that now has coins on the roof. Fall onto the platform, get the key, and swim to the keyhole.