SMW ǀ Unintended Exits ǀ Sunken Ghost Ship, secret exit [RTA]

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This is my attempt at a tutorial explaining how to perform unintended exits in Super Mario World. Super Mario World is a notoriously glitchy game, allowing the player to go beyond what was intended by the game designers. Normally, there is a total of 96 exits in the game. Over the years, dedicated gamers discovered several unintended exits (see https://pastebin.com/wqk0KfbM for list).
I want to find novel unintended exits. For this, I used unintendedly spawned Key and Keyhole in the level to trigger an unintended secret exit. Triggering a secret exit in levels having only a single normal exit activates the normal exit of the next level. However, when a normal level is not followed directly by a level, the unintended secret exit can add a new exit in the file counter! The 99th exit, Funky secret exit, is such an example (see    • SMW ǀ Unintended Exits ǀ Funky, secret exi...   for tutorial). Here, I want to trigger a secret exit in the Sunken Ghost Ship. This normal level is located at the end of the Chocolate Island, so I though a secret exit there could be an new unintended exit of SMW.
This glitch requires a lot of Powerup Incrementation to get Mario at Unintended PowerUp Status (between 4 and 255) to be able to spawn the Keyhole and the Key. Basically, Mario has to be at Power Status 211 to get the Keyhole in the Reserve Item box. After dying to reset our Power Status while preserving our Item box, Mario is brought to Power Status 112. This allows Mario to get a Winged Key in the Item box when collecting a Feather (this Powerup item is at the beginning of the level).
First, we have to get the Keyhole in our Reserve item box (see    • SMW ǀ Unintended Item Spawning ǀ Keyhole +...   for tutorial). This is achieved using the Powerup Incrementation glitch (see    • SMW ǀ Unintended Powerup State (Powerup In...   for tutorial). At Power Status 108, grabbing a 1Up-Mushroom (here in the Top Secret Area) will spawn the Key in the item box. We need a Key to ultimately get the Keyhole in the Item box. After, repeat Powerup Incrementation to go to Power Status 211. This Power Status allows Mario to spawn a Keyhole in the item box when collecting a Feather. So, to the Top Secret Area without Yoshi. Spawn the Yoshi and used it to grab the Winged Key in the item without being hurt. Leave the Key and Yoshi on the left and the right side of the central block respectively. Hit the left Feather block. Quickly, go on top of the Feather blocks and jump to catch to floating Feather. Try not to touch any input when collecting the Feather. Being at Power Status 211, Mario now has a Keyhole in the item box. Die in a pit. After collecting a Feather, bring Mario to Power Status 112. Go to the Sunken Ghost Ship uncleared. Spawn the Keyhole and collect the Feather. Watchout not to be trapped in the box! Then, spawn and grab the Key with Yoshi. Perform the unintended secret exit. After exiting, the game prompt immediately to save. No sound can be heard on the World map. Unfortunately, this exit is not accounted for in the file counter :( However, this exit still exist as we can exit by Start/Select the ‘uncleared’ Sunken Ghost Ship. This is like the Top Secret Area normal exit (see    • SMW ǀ Unintended Exits ǀ Top Secret Area, ...   for details).
Hope this video can help you in your quest to master SMW famous (and awesome) glitches.
My setup: I use an original Japanese Super Mario World cartridge played on a Super Retro Trio 3 Console (PAL version); I thus played in Real-Time Attack [RTA] without Saved States. Crappy video (and sound) captured using an ‘EasyCAP’ USB adapter (S-Video signal) and ‘Honestech VHS to DVD’ software. Video editing done using Shotcut free software.


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