Super Mario Bros. 2 (Japan)/World 9

The Most Elusive of the Lost Levels
World 9 and its four challenging stages can only be reached by hearty adventurers who complete all of the first eight worlds in one playing session. They are the ultimate Lost Levels. Please note that World 9, and all of the worlds beyond it, are not available to players in Super Mario Bros. Deluxe.
 * 1) Save the Toads: There are Toads in every one of the first seven worlds.  In order to qualify for admittance into World 9, you must first save the Toads in each of those worlds, then move on to World 8 and save the Princess.  If you warp past any of the dungeons, you'll go straight from World 8-4 to World A-1.
 * 2) Don't stop: The second condition that you must conform to in order to in order to reach World 9 is to play through the first eight worlds without quitting.  In Super Mario All-Stars, If you choose the "Save & Quit" option or reset the game at any point, you'll be locked out of the world.  You can, however, choose "Save & Continue" as many times as you wish.

Part A

 * Start your World 9 adventure off by dropping down into this faux Warp Zone into a wacky world that's been flooded by water.

Part B

 * The Coin Blocks at the beginning of this watery world are only an illusion. If you attempt to pop them from below, you might swim into the path of Bullet Bill.

Part C

 * Swim with the waves near the surface of the water in this section. You'll avoid contact with the water-bound Lakitu and Koopa Paratroopas who patrol the ocean floor.
 * The water has disarmed the Bullet Bill battery. You won't encounter any shells here.

Part D

 * Thanks to the water, it's impossible to miss out on a top score for grabbing the flagpole at its highest.

Part A

 * With Piranha Plant potential and a Lakitu between the pipes in this section, you'll do well by staying near the bottom of the screen.

Part B

 * Swim toward the surface here to avoid being chomped by the Piranha Plants.
 * Collect enough coins so that your total is a multiple of 11. Then hit the flagpole when the last digit of the timer matches.  You'll earn a 1-Up!

Part A

 * Start this seemingly empty world off with a light jog.

Part B

 * Hit the high brick at the start of this section to reveal a vine which leads unique and short coin heaven. Collect the Coins and return to your adventure.
 * While you can approach the edge of the lava pit in this area, there is no way to cross the surface of the pit. And there are no items of interest nearby.
 * The pipe at the very end of this section serves as an alternate entrance to the Coin-filled bonus area. After you sink into the pipe, you'll find your hero climbing an invisible vine up to the clouds.

Part C

 * Bowser appears in thie narrow passage. Avoid the ousted King of the Koopas by leaping through the hole in the ceiling just before this section, then run along the roof.

Part A

 * Various Mushroom Kingdom enemies will approach you one at a time in this watery passage. You can easily avoid them by swimming toward the surface.
 * When you reach the end of this ultimate Lost Level, you'll see a message in the block formations. It spells out "アリガトウ!" or "Arigatou!" which means "Thank you!" in Japanese.

Part B

 * Before you get to the end of this water stage, you'll encounter a flaming Podoboo. Watch it carefully and move quickly to avoid it.