Classic UNO is a simple and fun card game. The goal in the game is to play the cards in your hand as quickly as possible in order to win. The classic UNO game has a total of 108 cards, each with a different color and number. Players need to play cards in their own turn, and the cards played must match the cards played by the previous player, either of the same color or number. If the player is unable to play, they must draw a card from the pile. If they find a card that can be played, they can play within this round. There are also some special cards in the game, such as skip, flip, add 2, change color, and add 4. These cards can help players strengthen their game or have an impact on other players, making the game more interesting and challenging.