Dot Heroes: Woop Woop Ninja is an online mobile game, casual game, use your shuriken and deal tons of damage in arena to minion monster, dig treasure, upgrade your weapon, loot potion, coin, grape and level up, is free to play on Android and iOS devices, from Ariano Games.
Download the game at:
https://play.google.com/store/apps/details?id=air.com.arianogames.dh.ninja
https://itunes.apple.com/app/id963579797