Uberstrike Browser-based first person shooter using the Unity 3D game engine. It's one of the only FPS games available through facebook. Become an anime-styled pirate, wielding up to 34 different weapons. Some weapons require less skill than others (like the raged about Splatter Gun, used a great deal by new players due to its wide spread and high damage). The game works on both Mac OS and Windows. Regular group tournaments are available in teams of as few as one. There are more powerful weapons you can purchase on a per-day basis (for game-coin or real world cash). For a quick fix, the standard bat, machine gun, and plenty of map pick-up items should keep you gunning for an hour or so. See Videos >> Free, with option to pay for additional features.

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Uncharted Waters Online A nautical themed RPG, set in the Age of Exploration, between the 15th and 17th century, and based on real historical events. Start from six historical locations and choose from three classes plus a great number of professions (they can be changed instantly, albeit for a fee). Trade and earn money by shipping goods from one country to another, but beware of pirates; unearth hidden treasures and explore uncharted territories to bring glory to your allied nations. A slow but very rewarding game, UWO offers a truly unique experience for those willing to study its secrets. Great PvP and PvE opportunities, but the focus is set to exploring the massive game world and having adventures, both on the sea and on the shore. See Videos >> Free, with option to pay for additional features.

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	Uniball Spaceships playing a sort of soccer-like sport. Free to play indefinitely.
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	Urban Dead Make your way through derelict buildings and fend off the legions of the undead in this massively multiplayer zombie apocalypse. Free to play indefinitely.
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	Urban Rivals A massively multiplayer online trading card game. Very easy to learn. Level up to unlock "leader" cards, and use your winnings to purchase new cards for your deck. Cards also level up with use, gaining new abilities over time. More than 7 million players. Free, with option to pay for additional features.
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	Urban Terror Urban Terror can be described as a Hollywood tactical shooter; it is realistic to a certain extent, but the creators go by the motto "fun over realism." Free to play indefinitely.
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