The most notable change is the official clarification from UNO that stacking +2 on +2 or Draw 4 on Draw 4/Draw 2 is not permitted, challenging common house rules. Additionally, another variant ...

However, according to the official UNO rules posted on X (formerly Twitter), if a player places a +4 card, the next person must draw four cards and their turn is skipped. Stacking additional draw ...