Jump-In, Uno Wiki

Jump-In is an optional Uno rule. It states that if any player possesses a card of the exact same color and number/symbol as the card on top of the Discard Pile, he may immediately play said card at any time (as long as it is still matching and another card has not been placed on the pile).

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Jump-In, Uno Wiki

This is why you don't read the LoL wiki for advice : r

File:UNO-DB25 Pinout 2.PNG - Land Boards Wiki

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Uno, Just Dance Wiki