It’s not quite time for summer vacation, but May is a time for sunny days, warm weather, and plenty of great gaming courtesy of Games with Gold. In May, Games with Gold is adding CastleStorm: Definitive Edition, an awesome tower-defense brawler mashup title, for free, as well as extending Pool Nation in Games with Gold for another month on Xbox One. On the Xbox 360 front, two great games are coming free in May: Mafia II, a third-person action game that immerses players in the dark and unforgiving world of the Mafia in the 1940’s and 50’s, and F1 2013, a realistic, open-wheel racing sim.As usual, all games are available only for a limited time, as part of the on-going Games with Gold program.

CastleStorm: Definitive Edition ($14.99 ERP) Available from May 1-31 on Xbox One

On Xbox One, CastleStorm: Definitive Edition is a genre mash-up that combines medieval warfare with 2D physics-based destruction! Prepare to be challenged (in a good way) to manage a lot of battlefield elements at one time by controlling the battle in real-time, bombarding your enemy’s battlements with ballista-projected artillery, managing a fearsome ground attack, and casting powerful spells in epic conflict between Knights and Viking warriors! CastleStorm: Definitive Edition features a story-driven single-player campaign, a custom castle editor, online multiplayer and co-op modes, and more. Building castles and knocking them down has never been so much fun! In addition to the original CastleStorm campaign, the Definitive Edition includes two expansions, “From Outcast to Savior” and “The Warrior Queen” for the most complete CastleStorm package available.

Mafia II ($19.99 ERP): Available from May 1-15 on Xbox 360

Over on the Xbox 360, Xbox Live Gold members get treated first to Mafia II, which puts you in the shoes of Vito Scaletta, an Italian immigrant to America who finds himself wrapped up in an increasingly complex series of criminal plots in post-World War II America. As Vito, you’ll drive period cars all around Empire Bay, based on a pastiche of America’s biggest burgs, and blast your way through a variety of challenges, from bank robberies to ambushing rival gangs to sweet-talking your favorite molls. This is an enormous game with a lush, evocative narrative, and plenty of excellent writing and voice-acting to get you involved in the characters and the time period.

F1 2013 ($49.99 ERP): Available from May 16-31 on Xbox 360

But when you feel like dropping out of the 1950s and into the cockpit of a more modern machine, you’ve got F1 2013 coming at the end of May on Xbox 360, which features all the cars, drivers and circuits from the 2013 FIA Formula One World Championship plus all-new classic content from the 1980s. If getting behind the wheel of the most sophisticated automobiles on the planet is your thing, then F1 2013 has you covered. Praised for its realism and its presentation, this game is an absolute must have for racing fans through Games with Gold, so don’t hesitate to press that download button when it comes up later in the month!