In addition to giving the game depth, this psychological component may open doors for surprising wins. It's crucial to employ this tactic sparingly, though, as overusing it couldrummy up cause opponents to realize and change their tactics against you. Common errors in Rummy Mars 51 can hurt a player's chances of winning, even for experienced players. Keeping valuable cards for an extended period of time is a common mistake. Holding onto high-point cards can backfire if an opponent declares before you do, even though melds are crucial.