Boom Boom

Boom Boom is a boss which appears in every game style, including 3D World.

If he is stomped 3 times, he will be defeated and get a key if said object is placed on him.

Het can become bigger, gain a wing or be on a parachute.

In 3D World, he can become invisible and ride in his shell.

Trivia

 * Using a specific setup, 2 Boom Booms can fly. This is only possible in the 3D World style