High-concept summary, genre, target audience, and platform.

Setting, plot summary, and narrative tone.

Core loop, controls, player progression, and win/loss conditions.

Main characters, enemies, NPCs, and their roles.

World layout, environments, pacing, and puzzles.

HUD design, menus, navigation flows, and accessibility features.

Art style, color palettes, and visual influences.

Music style, sound effects, and voice acting requirements.

Game engine, target specifications, networking, and platform.

Monetization strategy, target market, and unique selling points.