Check out ongoing Humble Book Bundle: Game Design & Puzzlecraft
I heard a lot about Level Up! and Theory of Fun. Might be worth it.https://www.humblebundle.com/books/puzzlecraft-books
EA has the most downvoted comment on reddit
lol. minus 150k votes. That’s 150 000 downvotes for a single comment! Scratch that, it’s 356k!