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The game is actually called Q.U.B.E., so the main tag should be q.u.b.e, but qube already exists and is easier to type.
This can't be done. The system cleans up the q.u.b.e. tag to q.u.b.e (no last dot).
Since your request is all about correct punctuation and the system doesn't allow us to do that, the tag shall remain qube.