Can You Throw A Draw Four On A Draw Four. Otherwise youll draw 4 cards PLUS 2 extra cards. If you suspect that a Wild Draw 4 Card has been played on you illegally ie.
What you cant do. If you do not they draw 6 instead. Instead he can choose to throw his draw 4 or pick up 4 cards in case he have some strategy in his mind what will happen if he also throws a draw 4 on your draw 4.
The challenged player must show you the challenger their hand.
If you do not they draw 6 instead. Otherwise there is a common house rule regarding not ending your turn after receiving a Draw Two andor Wild Draw Four. Lastly you will come across cards called Wild Draw 4. Next person will pick up 12 cards now.