I was playing Uno and one player placed down a Draw 4 card, and set it to a colour (let's say red). The next player played a Draw 4 card, even though they had the colour specified by the first player (let's say red).
Is that a valid play? So, if I were to challenge the second player, would I win the challenge?
The rule is, you may not play a Wild Draw 4 unless you do not have any card that matches the color of the top card on the stack.
No, it's not valid to do so since according to the Mattel's UNO rules the next player forfeit their turn and MUST draw 4 cards from the pile.
But for the player after the next player (who had to pick up the 4 cards) it's a valid play.
Anything else is just house rules...
From mattel.com: https://service.mattel.com/instruction_sheets/42001pr.pdf
Wild Draw 4 Card - This card allows you to call the next color played and requires the next player to pick 4 cards from the DRAW pile and FORFEIT his/her turn.
Note: The player in turn (after the player who had to draw 4 cards) may play a Wild Draw 4 Card with consideration to the color chosen by the player playing the first Wild Draw 4 Card.
So in that case you could say that a Wild Draw 4 Card could be played on a Wild Draw 4 Card.
Remember that it's only the next player who can make the challenge.
Wild Draw 4 Card - ... Only the person required to draw the 4 cards can make the challenge.
You can put a 4+ On top of a 4+ next player for this example has to pick up 8 cards
Yes it is a valid play because when the next player puts another +4 it becomes +8 and goes to the 3rd person but what is not valid is that if someone has a +4 or wild card you cant choose the same color.
No, you may not place two draw four cards on top of each other.
I have seen several versions of the official rules. Some of them (mainly early versions) specifically allowed playing a draw 4 on a draw 4.
