A Theory of Fun for Game Design has 256 pages.
Game Design Workshop has 496 pages.
Chris Crawford on Game Design has 476 pages.
The Art of Computer Game Design has 476 pages.
The HAB Theory has 566 pages.
A Theory of Justice has 560 pages.
Demon Theory has 439 pages.
Design Patterns has 395 pages.
Distillation Design has 710 pages.
Do Good Design has 192 pages.
The Prometheus Design has 190 pages.
How to Design Programs has 720 pages.
Final Theory - novel - has 368 pages.