Maw of the Beast is the finale of bonus world 8. It's a big and atmospheric puzzle level.
The theme is cooperation with Yoshi to get him from one place to the next and eventually to this blue shell. Then you can fly to the exit and escape.
I'm surprised how well this is put together. The way each element is presented gives the player all the necessary clues to solve the puzzles. Every detail has a purpose. And it builds on knowledge that has been acquired throughout the game. Best puzzle level of JUMP½.
This unlocks the RNG Castle. Kick the die to determine the next room. Not my favorite. Some of the rooms are just ass.
To fight Bowser you get a shell cannon and a high-jump cape.
Fun and challenging boss fight with slight bullet hell elements.