game(s) -- theory / challenge(s)
_ .. / create / common(s) / art(s) / _ / .
- game space(s) -- possibility space(s)
- model(s) -- metaphor(s) / narrative(s)
- interaction loop(s) -- success/failure
- relation(s) -- real/virtual
- world(s) -- specific/abstract
- player(s) -- hardcore / casual
- grouping(s) -- competition(s) / specialization(s)
- behavior(s) -- state machine
