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Frequently Asked Questions

Don't worry, we all need to start somewhere—if you're a beginner and still need to find your way around, chances are the F.A.Q. will answer a lot of the questions you may have. Before asking in the forums, it's wise to check this page first!

If you have suggestions for the F.A.Q., feel free to contact a staff member.

Sprite Issues

Why doesn't my boss battle function correctly?
Bosses are some of the most complex sprites in the game, and require quite a lot of experimentation to edit. First of all, many boss settings are world-specific. If you use a boss in any world other than the one it originally appeared in, without changing these world-specific settings, your battle will likely be glitched. To relocate bosses to different worlds, you will need to use a hex-editor to swap certain setting bytes.

Below is a tutorial on how to make these hex edits by Zeldara109 and Mattrizzle.

Why isn't (insert other sprite here) working?
It depends on the specific sprite. However, in general, it can help to check the levels in the original game that use that sprite (checking existing YI hack levels can also help), and compare the header settings and surrounding object layouts.
How do I make a pipe generate Shy Guys?
Simply place Sprite 01E (Shy Guy) on the top left tile of Object F4 (unenterable vertical pipe). This will only work if the entrance is at the top of the pipe; attempting this with an upside down pipe will not work.
Why do my Shy Guys appear in front of pipes?
Shy Guys will appear in front of Object 3C (enterable vertical pipe) instead of appearing behind it. If you wish to make a Shy Guy-generating pipe enterable, you instead have to use Object F4, and place Sprite 042 (vertical pipe entrance) on the top left corner of the pipe. This sprite will allow Yoshi to enter the pipe by pressing down.