This version of UNO includes transparent, waterproof cards similar to UNO H2O and a special Whirlpool device. The Whirlpool has random effects that appear when shook (it works like a Magic 8-Ball).
The rules are simplified. For example, the winner conditions are no longer points based. The first player to win three hands wins the game. Also gone are rules regarding playing Wild Draw 4 Cards when you can play another card.
The Whirlpool is activated by playing a special Splash card or playing a 0 or a 2. The next player must then shake the Whirlpool and follow the results:
- Draw H2O - draw until they get a blue, 2, 0 or wild card.
- Wave Right - show a card to the player on the right.
- Wave Left - show a card to the player on the left.
- Wipeout - reverse order of play (player who started the Splash must use the whirlpool)
Other possible Whirlpool results are draw, discard and give cards.
The cards and Whirlpool are contained in a sturdy plastic box, with a slide on/off lid.