No, its against the rules.
No, you cannot put a wild card on a Draw 4 card in Uno.
No, you cannot put a wild card on a Draw 2 in the game of Uno.
No. The person who put down the wild card or draw four must still pick a color, the next player must still draw four and the game must continue on as usual. Hope this helped!
No, you cannot put a Draw 4 card on top of a Draw 2 card in Uno.
No, you cannot put a Draw 2 card on top of a Draw 4 card in Uno.
No, you cannot put a Draw 4 card on top of a Draw 2 card in Uno.
In Uno, you cannot put a Wild Card on top of another Wild Card.
No, you cannot put down a Draw 4 card on top of a Draw 2 card in the game.
No, you cannot put a Skip card on top of a Draw 2 card in Uno.
No, you cannot put a Skip card on top of a Draw 4 card in Uno.
No, in most card games, you cannot place a wild card on top of another wild card.
No, you cannot put a reverse on a Draw 2 card in Uno.