Waking Mars

It feels a little bit like Metroid and a little bit like an Alien spin-off, but Waking Mars is more about discovery than violence; the science-fiction plot has you exploring the depths of Mars, collecting research on new life forms, and cultivating that life in unique combinations. Simple touch controls abandon virtual analog pads for a far more organic feel. Now updated with Retina Display graphics, too. Trust us, it's cool.

Price: $4.99 (universal app)