Uno is a game of matching colors and numbers, where the objective is to be the first player to get rid of all your cards. Each player is dealt a hand of cards, and the remaining cards are placed face-down as a draw pile. The top card of the draw pile is turned face-up to start a discard pile.
On their turn, players must match the top card of the discard pile by either color, number, or by playing a special action card. Special action cards, such as Skip, Reverse, and Draw Two, add twists and strategic elements to the game.
Uno also allows players to play Wild cards, which can be played on any color and allow the player to change the active color. There are also Wild Draw Four cards, which not only change the color but also force the next player to draw four cards.
If a player is unable to play a card, they must draw from the draw pile. The game continues until one player has no cards left, at which point they are declared the winner of that round. Points are typically awarded to the other players based on the value of the cards they still hold, and the first player to reach a certain number of points (often 500) is declared the overall winner of the game.