A Chow A player can take a discard to form a sequence only if that discard comes from the player to one's left. If the sequence is drawn from the wall, it should not be declared, and may remain concealed . A Pung A player has a pair of identical tiles in hand and a third is either discarded or drawn from the wall. Unlike chow, a pung may be declared on a discard regardless of whether it is the player's turn, and any players in line to go are skipped.
Play continues to the right.
Pungs score points and concealed sets are more valuable than exposed ones from a scoring perspective. KONG Four of a kind. No kong can have more than one discard. But, in this case, the player will still get credit for a concealed kong if he wins. When the concealed kong is shown, it is shown with the two inside tiles face-up, and the two outside tiles, face down.