Game Design: Theory & Practice 2nd Edition -

: Build a "grey box" version with no art.

: Sam fires a magnetic tether. It only sticks to metallic "Retro-Tech" surfaces. While tethered, Sam’s momentum is preserved, allowing for wide swings. Game Design: Theory & Practice 2nd Edition

: How NPCs or systems react to this feature. : Build a "grey box" version with no art

Rouse outlines a specific iterative workflow to ensure a feature actually works in practice: Sam’s momentum is preserved

: Add final models, textures, and sounds only after it is fun.

: A concise summary of what the feature is and how it feels.

: Iterate on the basic feel and spatial layout.