.directionPerReel(['forward', 'reverse', 'forward', ...]) on the builder, one entry per reel (length must equal .reels(n)). Reels you omit fall back to .direction(). A big symbol spanning reels (size.reels > 1) throws at build() when the directions it straddles are mixed.
AnsweredReel motion & board shape
How do I spin one reel up and another down (mixed directions)?
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