What is uno blank cards?

Uno blank cards are cards that come in a pack of Uno cards but have no color or number printed on them, allowing players to create their own custom cards. These blank cards are often used to add more fun and variety to the game by allowing players to create their own rules or actions. The blank cards are compatible with most Uno decks and can be used in official Uno tournaments and games. Players can write on them with a pen or pencil to personalize the cards. Blank cards can be purchased as a part of the Uno card game along with the regular deck, or they may be available for purchase separately as an expansion pack.