What do I do if I suspect someone played a Wild Draw Two card illegally?
You may challenge that player to show you their hand. If they are guilty (they have a matching color card), they must draw the 2 cards instead of you. However, if they are innocent, you must draw 2 cards PLUS an additional 2 cards (4 total).
From the official Mattel GDR44 Uno Flip Card Game manual, page 1
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