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The «choice» macro produces passage links which can only be clicked once. If one is clicked, all other «choice» links in the passage are permanently disabled.
<<choice [[link syntax]]>>
There is also an older formulation, used in Twine 1.3.5:
<<choice “passage name” “link text”>>
This formulation is no longer recommended, as it conflicts with the link text and passage name ordering used by the normal link syntax.
The «choice» links have, in addition to their normal CSS classes, the class “choice”.