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UNO RULES

Rules extracted from: unorules.com

You can only play a card which has the same color/number/symbol with the card in the center.

Draw Two Card (+2)

Draw Two cards (labelled +2) forces the next player to draw two cards and forfeit his/her turn.

Reverse Card

Reverse cards reverses the flow of the game.

Skip Card

Skip cards jumps the next player of the cicle, and the player next to him plays.

Wild Card

Wild cards are cards that can alter the color during the play.

Wild Draw Four Card (+4)

Wild Draw Four cards (labelled +4) are basically a wild card and two Draw Two cards. The user can alter the color during the play, and the next player is forced to draw four cards and forfeit his/her turn.

Counters

Draw Two cards and Wild Draw Four cards can be stacked if you have a compatible card.
For example: if a player plays a Draw Two card at you, you can counter with another Draw Two card, or a Draw Four card. If the player don't have such a card, he/she draws the total number of draws involved in the process.
OBS.: A Draw Two card can be stacked with either another Draw Two or a Draw Four. Otherwise, a Draw Four card can only be stacked with another Draw Four.