A Draw Two Resolves the Turn
In official UNO, a Draw Two is a complete penalty, not the start of a penalty chain. The next player takes two cards from the draw pile and loses their turn. Because that turn is skipped, they do not get a chance to play a Draw Two of their own.
That distinction also means the cards do not accumulate: the next player draws two, rather than adding two more cards for the person after them. The penalty ends with the player who received it.
Why Stacking Changes the Game
When players agree to stack, they create a different system. A Draw Two can be passed onward, often growing the number of cards the eventual target must take. That turns the card from a fixed setback into a threat players can build—and gives the next person a reason to answer with another penalty card instead of simply drawing.
The official rule keeps the effect predictable: one card, two cards drawn, one turn skipped. Stacking can make a round swingier, but it is a house-rule variation, so players need to agree on it before the first penalty lands.
