This site uses the classic 108-card deck: 25 cards each in red, yellow, green and blue, plus 4 Wild and 4 Wild Draw Four. For 2–10 players; deal 7 each and begin with the player after the dealer. Play one card matching the discard's color, number or action. A Wild may be played at any time to choose a new color. You may voluntarily draw 1. If that new card is playable, play only it or end your turn; otherwise the turn passes automatically. Skip misses the next player. Reverse changes direction; with two players it skips the opponent. Draw Two makes the next player draw 2 and miss their turn. Draw penalties cannot be stacked. Wild Draw Four is legal only without the current color, but bluffing is possible. Its target may accept 4 and miss a turn, or challenge: a successful challenge makes the player of +4 draw 4 while the challenger keeps their turn; a failed challenge makes the challenger draw 6 and miss a turn. Only the challenger sees the other player's hand from that play as evidence. Call UNO before playing from two cards or immediately after reaching one. Until the next player begins drawing or playing, anyone may catch a missed call, forcing 2 draws. An opening Draw Two or Skip affects the first player; Reverse reverses direction and starts with the dealer; Wild lets the first player choose a color and play; return an opening +4 and reveal another. Recycle all but the top discard when the stock empties. First out wins, after resolving final draw penalties and any +4 challenge. Each game is one round, with no race to 500: numbers score face value, Skip/Reverse/Draw Two 20, Wild/+4 50. The winner receives the total value remaining in the other hands.

Rooms expire 24 hours after the last action. Refresh to reconnect; leaving ends the current game.