In 666e Rummy, blocking and controlling opponents is an essential skill that can provide you a big edge when playing. A good blocking tactic is to monitor the cards568 slots apk your opponents are gathering and modify your own play accordingly. Consider keeping cards from a specific suit to stop your opponent from finishing their melds if you observe that they are routinely picking up cards from that suit. In addition to upsetting their strategy, this tactic makes them adjust to your style of play.