Instructions
Wave 1
Avoid Bowser as he swoops back and forth in his clown-shaped ship. He will only stop after a few swings to throw two Mecha-Koopas from his ship.
Jump on the Mecha-Koopas. This will temporarily disable them and prevent you from getting harmed. Jump on a Mecha-Koopa if it gets up again.
Pick up one of the Mecha-Koopas.
Jump and throw the Mecha-Koopa at Bowser. If you hit the ship, nothing will happen; aim for Bowser's head.
Repeat steps 2 through 4. Bowser will fly out of the screen, and seven fireballs will fall from the sky.
Avoid the fireballs. Once they are gone, the Princess will appear in the ship, and she will throw you a growth mushroom or a fire flower, depending on whether you are Mario or Super Mario.
Wave 2
Continue to avoid Bowser's ship; he will fly around in a wiggling sort of motion above you.
Avoid the large balls Bowser drops from his ship by jumping over them or spin-jumping on them.
Repeat steps 2 through 6 from section 1.
Wave 3
Continue avoiding Bowser's ship, which will now be jumping up and down, pounding on the ground each time it drops.
Run under the ship instead of jumping over it to increase your chances of survival.
Repeat steps 2 through 6 from section 1 to defeat Bowser and set the Princess free.