G.I. Joe: Battleground was released for iOS and Android devices in July 2013. It was made by DeNA and Mobage, in association with Hasbro. It's a strategic card game of sorts.
After picking your leader from Scarlett, Flint, Duke or Snake Eyes, you build your squad out of characters. Players get bonuses for having teams made of the same faction, but you could mix, match and customise your team to how you see fit. Want a mixed bag of Joes and Cobras? you can. The character roster features well over a thousand characters across all generations, ranging from ARAH to Renegades and everything in between.
Combat is played out in a turn based system. Higher level characters, epics and upwards can launch vehicle based attacks, whereas anything rare and below can't, but have their own special abilities which can be triggered in combat. Commons can be used in fights, but it's not advised, as they'll be killed off pretty quickly. However, once combat is finished, players can capture enemy units, if the game allows it. Stun Grenades have a 100% capture rate, but they need to be bought, Flashbangs have a lower chance to capture.
Every month, DeNA would put up events where players could take on bosses to earn epic loot and special characters. It would be up to players to bring their best characters to the table and since it's freemium, it was almost expected of players to spend real money on the game to actually get anywhere with it.
You can check out a video of the game here. Sadly, DeNA ended the game and closed down the servers in January 2015. So you can't find the game anymore even on any stores. All fans have are memories of this unique, strategy card game.