Coloring outside the lines just got a little bit scarier

Anyone who’s used Angry Birds as an impromptu babysitter will appreciate Monster Coloring Book—an app that’ll keep the kids busy without sapping quite as many brain cells.

A free, “lite” version gives you a few monsters—and a variety of brushes, palettes, and patterns—to choose from. The full package costs $2.99 and gives you more monsters to play with. Either way, we found the interface to be simple and self-explanatory: Tech-savvy tykes can get to the coloring in a minute or two, and the boys and girls we polled were charmed from the get-go.

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Coloring outside the lines just got a little bit scarier