Start with 7 cards and a number card on the table. Match the top card’s color, number, or symbol, or play a Wild. First to empty their hand wins the round.

Draw one card at a time until you can play. You can keep drawing even with a playable card. You may play any matching card in your hand after drawing. Your turn ends when you play.

Only +2 can stack on +2. Only +4 can stack on +4. Penalties add up. Take the full stack if you don’t stack, then skip your turn. A stacked +4 is legal regardless of your hand.

Skip and Reverse both give you another turn. A Wild lets you choose the next color. Each round opens with a number card; special cards stay in the deck or your hand.

A first +4 is legal only if you have no card of the current color. You can bluff. Your friend can challenge before drawing or stacking. If you bluffed, you draw 4 and they keep their turn. Otherwise they draw the stack plus 2 and skip. Stacking gives up the challenge.

Arm the UNO button before playing your second-to-last card, or call it once you have one left. Your friend can catch you for 2 cards before their next play or draw. Calling and catching are decided in server arrival order.

108 unique cards: 76 numbers, 24 action cards, 4 Wilds and 4 +4s. When the draw pile runs out, the discard pile is shuffled back in, leaving its top card in place. If no cards or legal moves remain, you can pass.

Number cards score face value, action cards 20, Wilds 50. The winner earns the other hand’s points; first to 500 wins the match. A final +2 or +4 must be paid before scoring, with no further stacking. A final +4 may still be challenged.