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I find the controls very confusing. It's hard to guess whether I'm going to make a move or reorient the cube. Usually, it makes a move when I'm trying to reorient the cube.

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I think you can drag on the space around the cube to reorient without making a move.

(OP) You're right - left-mousing outside of the cube and moving the mouse around re-orients the cube. Left-mousing a face and dragging across one of the four boundaries of that face will rotate the face in the direction of the boundary you crossed.

I'm wondering if there would be a clean way to communicate the above to the user other than having them experiment and find it on their own.

You could try putting double arrows around the corners and sides. Like these (unicode): ⬌ ⬍ ⤡ ⤢

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