Forget everything you thought you knew… Card Game UNO has released a Twitter statement confirming the widely ignored rule that you CANNOT stack your +4 or +2 cars and fans are not happy.
Stacking +4 and +2 cards is one of the most popular strategies out there to help get players closer to looking around the table with the look on face and proclaiming “UNO!”

And apparently, the internet had a lot to say about it:
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So the next time someone puts down a +4 card, you’re either going to have to draw four cards or skip your turn.