Mobile gaming has come a long way since the endless days of Tetris on your Nokia brick phone.
Now, some gaming apps rival the inventiveness and difficulty of top-tier console games, and we're not complaining. If you're looking for more of a challenge in your mobile gaming experience, look no further than this gallery of the 10 most challenging examples out there.
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Be warned: some of these games walk a very fine line between challenging and flat-out impossible. If you're a gamer with anger management issues, you might want to wrap your phone in bubble wrap before you get started.