This is great because this helps you complete your set even if you don’t have the necessary cards. You can play those cards at any time and place your marker anywhere on the board that will help you get 5 consecutive markers. The reason that there aren’t any pictures of Jacks on the board is because they are special cards. Even though you might have those consecutive cards in your hand that doesn’t mean the pictures are in consecutive order on the board. The pictures will be going along in order and then suddenly switches directions.
The pictures on the board are mostly in order. Each card is pictured twice on the board - except for Jacks.
