Add Card and Deck classes
Add PlayingCard and PlayingCardDeck subclasses
L03 04:57 Flip through the whole deck using random cards
L03 06:01 Start with the card face down
L03 07:34 Stop flipping when out of cards
L03 09:10 Stop incrementing flipCount when out of cards
L03 END Rewrite the application to make a simple game

Put the game logic in CardMatchingGame model
Rewrite CardGameViewController
Keep a score
Rewrite the match function