Adscend Media and other major networks allow content made about video games only if unique, show reference and not use guide book material. Should money making guides for a MMORPG be made, for example this goes through as property of the author *labeling you allowed*. Locking a library book to large games is against the rules, alike eBook strategy guides.
Don't ever think the gaming niche isn't as easy to follow the rules as expected, learn standards or apply trend data into something new. Examples of this would be a beaten save files, custom character requirements or compound secrets.