For all of the examples, touch the edge of the screen indicated by a series of suspicious looking parts next to it. You'll be teleported to the secret room where you can obtain lots of ether crystals.

Stage 1: Left wall, two small blocks close to each other.

Stage 2: Right wall, two ether crystals next to the edge and an ambush lobster looming above it.

Stage 3: Left wall, two small blocks close to each other, two jellyfish outside of it.

Stage 4: Left wall, three urchins in a column.

Stage 5: Left wall, three urchins closing on the edge underneath a bubble row obstacle.