So this is why people looked at linear="no"
RE: Items listed in <spine toc="ncx">
Quote:
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While not required, you can add the attribute linear="no" to any of the itemref elements. This means that the section will be skipped if the reader is paging through the eBook. However, you can permit access to the content by creating a hyperlink. This may be a useful feature if you want to create an educational eBook with hidden answer keys.
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Except it only works in some epub3 renderers, so useless
The example link in the paragraph above is dead.
https://github.com/krisztianmukli/ep...ntent.opf-File
So it looks like that you can only duplicate a printed "Plot your own adventure", replacing "Goto page <nnn>" with a link on the choice text.
Not a big deal.
P.S. No need to remove any item for Kindle as suggested in link above if the epub is being uploaded to Amazon or converted by Calibre. At least now, anyway. Amazon and Calibre conversions from decent epub2 to old mobi, azw3/kf8 and kfx are perfect.