Atari's 80s arcade classic is remade for Apple's iPhone and iPod Touch. The original defend-the-cities game now has both an Ultra and Classic mode. The Ultra mode takes the established game of shooting attacking UFOs out of the sky with the player's missiles from ground bases and adds multipliers, boss UFOs, and updated graphics. The Classic mode sports an authentic remake of the classic for the touch screen. The iPhone's touch screen adds multi-touch gameplay. [source:mobygames]