In addition to monitoring their opponents' movements, players must effectively communicate with their teammates. Based on the kinds of melds that are formed, the game introduces a satta listnumber of scoring mechanisms, such as mixed canastas (which contain wild cards) & natural canastas (which do not). Choosing when to play melds and when to hold onto cards for possible future plays is where Canasta's strategic depth lies. Through rounds that require strategic choices and teamwork, Canasta provides a special fusion of rivalry and friendship.