Bringing games to mobile phones has come with challenges. Touchscreens don't handle some genres as well as traditional controllers. Interface elements need to be large enough for fingertips. Some titles, frankly, feel shoehorned to fit on phones.

The Lifeline series of games are an exception. I don't mean these are three titles that are remarkably well adapted for small touch controls. This series offers an experience that only feels natural on a phone, and today you can get all three entries for 10 cents apiece.

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