Puzzle Pirates is a free massively multiplayer online Browser based game.
Jump into a quick, puzzle-packed adventure with up to three friends!
Battle scallywags, find sunken treasure and get yer sea legs aboard a stalwart pirate ship... all from your web browser! Before you install Puzzle Pirates, take a Pirate Adventure and lead yer mates on bold pirate quests! Master the art of swordplay and sea-dog brawling on the high seas, explore uncharted islands and claim yer pirate booty! Yer adventure awaits!
Official site: http://www.puzzlepirates.com/