Gameplay - Articles & rules of thum. Where?

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1. Free PDF Download of The Art of Computer Game Design by Chris Crawford originally published in 1982. This is the Bible of Computer Game Design!

2. Chris Crawford on Game Design published in 2003 and this is an awesome book!

3. The Art of Interactive Design by Chris Crawford. Published in 2002. This is a very good book.

4. Chris Crawford on Interactive Storytelling published in 2004. This will only be useful if you have a story driven game. But it is a good book.