2/18 Books to Look Into

A Theory of Fun for Game Design
https://www.amazon.com/Theory-Game-Design-Raph-Koster-ebook/dp/B00GK5SRFY/ref=sr_1_1?ie=UTF8&qid=1518987325&sr=8-1&keywords=a+theory+of+fun+for+game+design

Rules of Play
https://www.amazon.com/Rules-Play-Design-Fundamentals-Press/dp/0262240459

Level Up! The Guide to Great Video Game Design
https://www.amazon.com/Level-Guide-Great-Video-Design/dp/1118877160