The venerable hack-and-slash is a game genre that transfers well to mobile devices, and there are plenty of examples on Android. However, many of them are loaded down with in-app purchases. I'm looking at you, Dungeon Hunter 5. Implosion, from the developer of the popular music rhythm game Cytus, is a cool-looking hack-and-slash that only charges you once. It's expensive, but you can try before you buy.

Implosion is set in a post-apocalyptic future as a mysterious enemy called XADA has launched an attack on humanity, hoping to drive us to extinction.

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