Description from the publisher:
The fastest wordgame in the west.
Players race to shout a word that contains at least one letter from each of the 2 central cards AND at least one letter from each face-up card in front of you.
To start with, you have no cards in front of you, so including a specific 2 letters will get you a point.
As the game goes on, better players will have more and more cards in front of themselves. This gives the game escalating difficulty, and also provides a catchup mechanism.
This is one of many games playable with the Wibbell++ deck.