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I already bought it on Steam and I got it for free in UPlay and I alrerady have its Collector Edition for Xbox 360.

The Collector Edition have some songs from the Soundtrack and the videos from the making of. So I don't think it is really worth for me to buy it again because of them.

However I saw in the store page that one of goodies is a Story Book? What is it? Is it the same storybook made by PennyArcade? Or is it something else?
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Yes, it is the story book of Penny Arcade. It is a *.swf file, which can be opened in browser. I attached a screenshot of it.
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