This is not your grandmother's puzzle app (if indeed, your grandmother even has a smartphone). Spectrum features a wide variety of cool features. The basic object is to unscramble images by sliding pieces around the screen. The app comes preloaded with nearly 50 vibrant, high-quality images to put together. These images cover the "spectrum" from still-life photos and nature shots to buildings and machines. Expires Mar 23, 2013

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