Calc Fast ($0.99): Challenge your brain by solving math problems as quickly as possible.

Zombie Age 2 Premium ($0.99): A 2D side-scroller action game set in zombie apocalypse times with a coop mode.

Hills Legend: Horror ($0.99): FPS survival horror game that forces you to explore a creepy (abandoned?) mental hospital.

Impossible Story 2d platformer ($3.99): A hard-as-nails 2D platformer with more than 200 levels.

Colorimeter ($1.29): Measure color parameters using your phone camera.

PDF Creator & Converter ($2.99): Create multiple-page PDF files by selecting different images in your phone.

How much can I spend? ($2.99): Control your budget without micromanaging all your expenses.

Crypto Helper ($0.99): No it is not an app to farm alt-coins.

With Amazon Prime Trial Temporarily free Android apps on the Google Play Store Free Android apps

A good way not to miss out on a short-lived promotion. This way, the app will become part of your app library, and you can install it again for free when you need it.

Quick tip: Have you found an interesting app, but you can't really use it at the moment? Install the app anyway, then delete it from your device. Google Play Store's limited-time deals on apps are fairly easy to predict, but it's more complicated with App Store deals since Apple doesn't specify how long the discount is valid. Between this page going online and the time you view this article, some apps may have become paid again. This list is updated twice a week, on Tuesday and Friday.

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