Holding onto high-value cards without creating sets or sequences with them is a common mistake. If another player declares "Jungle Rummy" before you have a chance to form your sets and sequences, this cotop rummyuld result in a significant number of points being counted against you. Keep Precious Cards Safe From Early Discardment. Discarding valuable cards too soon in the game without thinking about how they might be used later is another common mistake. To increase your chances of creating sets & sequences with the cards that are still in your hand, it's critical to carefully consider which cards to discard.