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Many Google Play Store Games are free and some of them are available at discounted price.

Collect or Die [google.com] – Free, was $ 1.99
Star Traders RPG Elite [google.com] – $ 0.99, was $ 2.99
Downwell [google.com]– $ 0.99, was $ 2.99
Linia [google.com]– Free, was $ 0.99