Ocho is a popular traditional Spanish card game, also known as "Crazy Eyes". It has a gameplay similar to the classic card game "UNO", but focuses more on strategy and judgment.

Before the game starts, players need to remove all the big and small kings from a deck of playing cards. Each card has different points and colors, and players need to use up all the cards in their hands by playing. In Ocho games, players must play cards in their own turn, and the cards played must match the suit or points of the previous card. If the card cannot be played, one must be drawn from the deck and still need to be checked to see if it can be played. Unlike the classic game you do not have to declare UNO and there are no challenges for more fluent games. There are some special cards in the game, such as "Reverse", "Skip", "Draw Two", etc., that allow players to strengthen or weaken other players' cards in the game.