I understand that mobile gaming isn't for everyone, but I can think of a handful of games that I've played endless during my commute and completely fallen in love with - Doodle Jump, Tiny Wings, Collision Effect - one of my personal favourites is Cut the Rope, and apparently it's about to get a sequel.
IGN has an image showing two ropes - so we're guessing that may be the evolution in terms of game mechanics. That being said, we're unsure precisely how that will make the tiniest shred of difference in how the game works.
The App Store is admittedly packed the gunnels with garbage and 'me too' flash derivatives, but the original Cut the Rope always felt like a true original.
Personally, I'm looking forward to the sequel.