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Full user review
"Game is good, but this "freeware" download is terrible"
The actual game is, as I've heard from friends, awesome.
This "freeware" just opens a "Minecraft Launcher" where you can register an account, but it won't let you play unless you buy the actual game.
You can just as well go to http://www.minecraft.net/download, where it says "When you have bought the game, you can download the stand-alone launcher for Minecraft here." I think it's kind of a lie to make people believe you can actually download Minecraft on this page.