Time limit: 10 second
Shoot paying card behind trapdoors to get to 21 without going over. Shoot cards to score that many points. Aces count for 11, face cards for 10. So Basically, you need an Ace and a face card to score 21 points.
All the trapdoors will be open with the cards shown for about two seconds before the challenge begin, take this moment to memorize where the ace & face card are. After the trapdoors are close, challenge began. knock the doors open and shoot the cards