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This isn’t a deal per se since the regular price of the game is $9.99, however I wanted to recommend this game because it’s such a blast to play. It’s a really fun coop game that gets pretty chaotic at times. There’s also a lot of humerous pop culture references thrown in. It’s a little buggy at the moment but the developers are working on the issues. A demo is available!
From the Magicka wiki:
In Magicka, four mages from a sacred order fight against an evil sorcerer and his creations. The game world is based loosely on Norse Mythology, drawing inspiration from other western fantasy settings such as Warhammer and featuring numerous humorous references to various video games, novels and fictional universes including Star Wars and World of Warcraft as well as games its creators drew inspiration from such as Diablo.