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Proto:Super Mario World 2: Yoshi's Island/ys rom 0 D

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This is a sub-page of Proto:Super Mario World 2: Yoshi's Island.

Yoshi's Island (ys rom 0 D) Title screen.png
To do:
There's way too much duplicate info here. This page should only cover the differences from the previous prototype build.

This prototype of Yoshi's Island was also found in the July 24, 2020 leak. While it's rather similar to the ys_romX_0 build from the same leak, this one has the final game's music and sounds.

To get the ROM working, change 30 to 20 at 0x7FD5 to correct the header. Depending on the emulator, you may also need to change 03 to 05 at 0x7FBD.


Countless differences that were in the ys_romX_0 build also apply here, so below are the changes in this build:

  • Yoshi builds up momentum much faster than in ys_romX_0, though his top speed is still slower than in the final.
  • Some stages either had minor alterations, or were replaced entirely.
  • The items that get preloaded into the inventory under File 1 have corrupted graphics in this build, but still work as intended.
  • The title screen logo was replaced with a larger simplified design. It was reverted to the previous logo in the final game.

Audio Differences

Despite now featuring the music and sounds from Yoshi's Island, the audio is still far away from final.

  • No level start music.
  • Death jingle sounds different.
  • When the Baby Mario timer reaches below 10, a Yoshi's Island-style rendition of the Mario series' "hurry up" fanfare plays and the level music speeds up. The music will go back to normal once you get the timer above 10 again.
  • The level select uses a different rendition of the prologue theme from the final release that features more instruments.
  • Different sound for the end-of-level Flower roulette.
  • Different sound effect for losing a second of the Baby Mario timer.
  • Countless missing sounds (like the lack of a sound for selecting a level).


While most levels barely had any changes between ys_romX_0 and this build, there are still some changes that happened. Note that all levels in this build use the same music, which was retained for some levels of the final version (most famously "Touch Fuzzy Get Dizzy").

Ys romX 0 & ys rom 0 D w1-8 Preview.png
World 1
The world of gooey blobs.
Ys romX 0 & ys rom 0 D w2-8 Preview.png
World 2
Move over Piranha Plant! Ghost Plants are where it's at!
Ys romX 0 & ys rom 0 D w3-1 Preview.png
World 3
That's a lot of turtles...
Ys romX 0 & ys rom 0 D w4-1 Preview.png
World 4
Poochy strikes back!
Ys romX 0 & ys rom 0 D w5-8 Preview.png
World 5
You've heard of lunar rabbits, now get ready for lunar ravens!
Ys romX 0 & ys rom 0 D w6-8 Preview.png
World 6
Look, it's from Baby Bowser!