Vanilla Dome 3
From the Super Mario Wiki
Vanilla Dome 3 is the third level of Vanilla Dome in Super Mario World. It can be accessed through the completion of Vanilla Ghost House. By completing this level, the player gains access to Vanilla Dome 4. The level takes place on a lava river in the Vanilla Dome world. At the start of the level, there are two Flying Question Blocks and a stationary one. The first Flying Question Block and the stationary one are coin blocks, and the top Flying Question Block contains a 1-Up Mushroom.
The player must continue on the lava river while standing on Skull Rafts and avoiding Blarggs. On the next platform, the player will need to hit an invisible Coin Block to get over the pipes. There is also a power-up Question Block containing a Cape Feather. Afterwards, there is a blue Beach Koopa kicking a red shell up and down the adjacent pipe, right underneath the midpoint gate. After that, there are more Skull Rafts, and they continue until the end of the level. With a cape, the Mario Bros. can fly up to the ceiling near where the orange tubes and invisible blocks are to go through a pipe to a bonus game.