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This review is from: Design Rules for Free-to-Play Games (Kindle Edition)
You can read this primer in one sitting. Its friendly tone guides you through the key concepts of free to play (f2p) game design with no complicated or over-technical language.
Even if you're not making an f2p game, this book contains information no game designer should be without.
It also works like a checklist so as you're designing your game, you can check you have thought about the topics covered in each informative chapter.