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This is an strategy game made by Supercell, who also made Clash of Clans, it's an online game, where you compete with players around the world. I rather this game style because you have 3 castles to defend, using a lot of monsters or creatures. You have to stand out and make great strategies to win.
This is the Google Play store direct link to download the game: https://play.google.com/store/apps/details?id=com.supercell.clashroyale&hl=es_419
Hope you like it