Mirror's Edge was a case of hit or miss for many. The game received very mixed reviews and sales didn't seem to be anything worth boasting about. That didn't stop EA from having versions for both iPhone and iPad being made later on.
As part of EA's mobile Daily Deals (which hits the brakes on January 2), Mirror's Edge on iPad and iPhone is, for today only, absolutely free. Other deals that you may either laugh at or take seriously include Tetris DLC being 30% off.