The correct section of the game design document that describes the project's objectives, progressions, UX, and UI elements is **Project Summary**.

The part of the game design document that describes the project's objectives, progressions, UX (User Experience) and UI (User Interface) elements is typically the **Project Summary** section. Here's a brief overview of what each part usually covers: - **Gameplay**: Details the core mechanics and player's actions within the game. - **Project Summary**: Provides an overview of the game's objectives, progressions, and high-level design, including UX and UI elements. - **Assets**: Lists the art, sound, and other resources needed for the game. - **Mechanics**: Explains the rules and underlying systems that drive the gameplay.