Back Door Walkthrough - Super Mario World 100% Walkthrough
To fight Bowser you have 2 options: go through the Front Door or go through the Back Door. You only need to do one or the other as they both count as the same exit. The Back Door is by far the better choice as it not only skips most of the level, but also gives you a checkpoint just before the Bowser fight.
Bowser Fight (0:39) - The fight occurs in 3 stages. During each stage Bowser will fly around and periodically toss 1 or 2 Mechakoopa onto the ground. You need to jump onto them to smush them and then pick them up and throw them into the air so that they hit Bowser. After hitting him twice per stage the some fire will rain down and Peach will throw a Mushroom at you.
During the first 2 stages you don't need to dodge Bowser so long as you're standing on the ground as he doesn't fly low enough to hit you.
During the 2nd stage Bowser will drop Big Steelies onto you which can be jumped over.
During the 3rd stage he bounces on the ground which you must dodge. While he is flying around you can touch the side of his Koopa Clown Car without taking damage, but touching the propeller WILL hurt you so be careful of that. After successfully hitting him a total of 6 times, he will be defeated.
Front Door: https://youtu.be/DAi5Ny5gfro
Super Mario World 100% Walkthrough Playlist: https://youtube.com/playlist?list=PLWdUn5TiM4AnmbcVfEnM258NfYQziI8w5
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