First, World of Tanks. World of Tanks is a tank game that is very realistic, and it is very fun, my favorite tanks are (so far) are the KV-1, T-34, Cromwell, Matilda, Chi-ha, the Pz IV Ausf.A, and Crusader. I love the KV-1, as it is very armored, so I can tank enemy hits.

KV-1 (my most favorite)

Matilda

Second is world of Warships, and yes they were created by the same developers as World of Tanks. It is a game of warships during WW2 (like World of Tanks) and you play as warships, fight enemies in battle, gain xp, and get enough to upgrade and buy your ships (like World of Tanks, but it's warships instead of tanks.)

Star Wars commander. Star Wars commander is a game where you choose your side: the Empire or Rebels, and you upgrade your base from a homestead, into a fortress.

N.O.V.A. 3 Nova 3 is a game where you play as Kal Warden, a very famed soldier who retired, had to go back in order to stop the enemies (the corrupted marines) that were invading earth for taking some artifact or something. It is like a mobile game of halo, but it is actually good! and people still play, as it is now 7 years old (lol Bungie's favorite number.)

Cold War (2012 colorized)