Amazon has updated the games that Prime members can play for free on Amazon Luna, its cloud gaming service. December brings five new games that can be played all month and they are Dusk, a retro FPS, The Legend of Heroes: Trails from Zero, a role-playing game, Joggernauts, a co-op platformer, Windjammers 2, a disc throwing sports game, and The Smurfs: Mission Vileaf, another platformer. These Luna games are playable on most Fire TV models, computers, phones, tablets, and newer Samsung Smart TVs. They work best with the Luna Controller, thanks to its ability to connect directly to Luna’s game servers over wifi for reduced latency, but generic Bluetooth, Xbox, or PlayStation controllers work as well. If you don’t have a controller to use, you can use your phone as a virtual controller to give the service a try without spending any money.