http://aushestov.ru/challenges-of-game-designers-%d0%b3%d0%bb%d0%b0%d0%b2%d0%b0-2-%d0%b0%d1%82%d0%be%d0%bc%d1%8b-%d0%b3%d0%b5%d0%b9%d0%bc-%d0%b4%d0%b8%d0%b7%d0%b0%d0%b9%d0%bd%d0%b0/
Challenges for Game Designers: Глава 2. Атомы гейм-дизайна