How do I open the box under the floor?
1. It's all fun and games to the thief, isn't it?
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2. Don't the pieces on this box's lid remind you of a game too?
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3. They're domino pieces.
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4. Tap one to select, then either tap it again to rotate, or tap another one to swap places.
(PARTIAL SOLUTION FOLLOWS)
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5. Place all the dominoes in such a way that the configuration flows: only the same numbers should touch.
(SOLUTION FOLLOWS)
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6. Tap for a screenshot with complete solution.