Atari's greatest hits has 100 classic arcade and 2600 titles, reworked for Apple devices.
You get a single game for free, pong, the rest come either in packs of four for roughly one USD, or 15 USD for all 99 games.



Check out the following articles about the game:



http://toucharcade.com/2011/04/07/ataris-greatest-hits-review-my-god-its-full-of-pixels/



http://www.maclife.com/article/news/atari_launches_massively_epic_retro_gaming_app