Concentrating on building canastas as soon as possible is a key tactic in the game of Canasta. If you form canastas early in the game, your team will havplay slots real moneye a significant advantage because they are worth a lot of points. Observing Your Rivals. Observing the cards your opponents are discarding and picking up can also be very helpful in determining which cards to keep & which to discard because it can provide you with important information about their hand.