Plot: Coin Master is a free, single-player, casual mobile game created by Israeli studio Moon Active. It has had over 100 million downloads. Coin Master is the top-grossing mobile game in the UK and Germany. Wikipedia
Plot: Candy Crush Saga is a free-to-play match-three puzzle video game released by King on April 12, 2012, for Facebook; other versions for iOS, Android, Windows Phone, and Windows 10 followed. It is a variation of their browser game Candy Crush. Wikipedia
Plot: The Battle Cats is a free-to-play tower defense game developed by PONOS Corporation for iOS and Android mobile devices, which first emerged in Japan under the name Nyanko Daisensou. Wikipedia