Players: 2 to 10 players, ages 7 and older.

Cards: Played with a standard 108-to-112 card deck containing four color suits (Red, Yellow, Green, Blue), numbered cards (0–9), and special action cards.

Deal: Shuffle the deck and deal 7 cards to each player.

Draw & Discard Piles: Place the remaining deck face down as the draw pile, then flip over the top card to start the discard pile. If the first flipped card is a Wild or action card, standard rules typically ignore or re-draw it depending on the edition.

Turn Order: The player to the dealer’s left goes first, and play moves clockwise.

Matching: On your turn, you must play a card from your hand that matches the top card of the discard pile by color, number, or symbol .

Drawing Cards: If you cannot or choose not to play a card, you must draw one card from the draw pile. If that newly drawn card is playable, you may choose to play it immediately.

Saying "UNO": The moment you play your next-to-last card (leaving you with just 1 card), you must yell "UNO!" . If another player catches you before the next player takes a turn, you must draw 2 to 4 penalty cards (depending on official vs. house rules).

Skip: The next player in line loses their turn.

Reverse: Changes the direction of play (from clockwise to counter-clockwise, or vice versa). In a 2-player game, a Reverse acts like a Skip.

Draw Two (+2): The next player must draw 2 cards and misses their turn.

Wild Card: Can be played on any turn; the player who plays it chooses which color continues play.

Wild Draw Four (+4): Allows the player to choose the next color and forces the next player to draw 4 cards and lose their turn. The victim has the right to challenge if they believe you held a card of the matching color in your hand.

Round Winner: The first person to empty their hand wins the round.

Point System (Optional): You can play to 500 points . Number cards count at face value, action cards (Skip, Reverse, Draw Two) are worth 20 points , and Wild cards are worth 50 points . The winner of the round scores points equal to the total value of cards left in their opponents' hands.

Forgetting to say "UNO!": If you have only one card left and forget to call out "UNO!" before your card touches the discard pile, you must draw 2 cards —if an opponent catches you before the next player takes a turn (draws, plays, or touches the pile). If you realize your mistake and say "UNO!" before anyone catches you, there is no penalty.

Wild Draw Four Challenge: If a player uses a Wild Draw Four, the next player can challenge them. The player must privately show their hand.

• If the challenger was right (the player did have a matching color in hand), the challenged player draws 4 cards .
• If the challenger was wrong (the player had no matching color), the challenger draws 6 cards (the 4 they were supposed to draw plus 2 more) and loses their turn.

Playing out of turn / Wrong card: If a player plays a card when it is not their turn or plays an invalid card, official rules typically require them to take the card back and draw a penalty card (or 2 cards depending on the rule interpretation).