The tower defense genre may not have been born on mobile devices, but it's a match made in heaven. Tapping on stationary structures and slowly moving units is a gameplay style better suited to touchscreens than gamepads or, arguably, mice. The basics have been done to death by now, so developers are coming up with creative new ways to expand the genre.

In Clandestine: Anomaly (no relation to the superb Anomaly series of tower defense games), developer ZenFri has combined top-down strategy with augmented reality. Here's a game that doesn't just rely on your touchscreen, it needs your camera and GPS as well.

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