What is your favorite mobile game?

Bubble Shoot (windows phone).
Windows Phone jokes aside, it's the only game I find myself playing over and over. Something about it lets me zone out when I need to and it's challenging enough, but not too deep either.
 
I enjoy a lot of the Humble bundle android games. The original Camageddon (from dos/win95) is great and very accurate to the original (needs network play though) I am also a fan of tower defence games, and anything from Hexage
 
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