Amazon is continuing it’s 3rd month of offering Prime members the ability to play select games for free through the Amazon Luna cloud gaming service. For the entire month of May, Prime members can play the motorcycle racing game Ride 4, the first-person sword slashing game Ghost Runner, the stunt driving game Monstor Truck Championship, and the classic arcade shooter Metal Slug 3. Amazon is also adding a few new games in May for those that are subscribed to the various Luna channels. Luna+ Channel subscribers can now play Super Monkey Ball Banana Mania, Retro Channel subscribers are gaining Capcom Arcade Stadium, and Family Channel can now play Get Packed. Remember, you can now use a smart phone as a virtual controller to play these Luna games if you don’t have a physical gamepad. It’s certainly not ideal, but good enough to at least see how good your connection to the service is before shelling out for something like the Luna Controller.