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).

Universal Network Objects - Wikipedia

JoJolion - Volume 1 - JoJo's Bizarre Encyclopedia

Shoma Uno - Wikipedia

Component Architecture - Apache OpenOffice Wiki

Vs. Bob and Bosip, Characters, Funkipedia Mods Wiki

House Rules, Uno Wiki

Unotfm, Transformice Wiki

Steam Workshop::Scripted UNO Improved + Jump-Ins

List of Katekyo Hitman Reborn! chapters and volumes