It’s a hard truth, but UNO has officially confirmed that +4 or +2 cards cannot be stacked — at all.
The company issued a post on Twitter confirming that the move has in fact been illegal all along and that the company knows you’ve been trying to pull it off sneakily or for some obviously. Apparently, if a player puts down a +4 card, the next player must simply draw four cards and skip their turn. No stacking allowed.
This post has of course shocked players all over the globe even tho it has always clearly been in the rules.
So just remember next time your mate is trying to get you to draw those 12 cards you can just say no!