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             - Consider bottlenecks and determine solutions
     - Exercises:
         - [Design a random unique ID generation system](https://blog.twitter.com/2010/announcing-snowflake)
-        - [Design an online multiplayer card game](http://www.indieflashblog.com/how-to-create-an-asynchronous-multiplayer-game.html)
         - [Design a key-value database](http://www.slideshare.net/dvirsky/introduction-to-redis)
         - [Design a picture sharing system](http://highscalability.com/blog/2011/12/6/instagram-architecture-14-million-users-terabytes-of-photos.html)
         - [Design a recommendation system](http://ijcai13.org/files/tutorial_slides/td3.pdf)