Game Design: Theory & Practice 2nd Edition -

: Add the actual mechanics (combat, puzzles, etc.).

: Fast-paced, non-violent action using inventive environmental interactions. Game Design: Theory & Practice 2nd Edition

: Observe unbiased players to see if the feature meets expectations. Example: "The Magnet-Grapple" (Atomic Sam Style) : Add the actual mechanics (combat, puzzles, etc

: Add final models, textures, and sounds only after it is fun. : Add the actual mechanics (combat

: Iterate on the basic feel and spatial layout.