The User Interface (UI) in Peace Walker provides crucial information during missions and while managing Mother Base. During missions, pay attention to:

- Radar: Displays enemy positions, alert status, and mission objectives. Essential for stealth.
- Stamina Gauge: Depletes when running, taking damage, or performing strenuous actions. Replenish with rations or recovery items.
- Health Bar: Your life force. Depletes when taking damage. If it reaches zero, it's game over.
- Weapon/Item Slots: Shows your currently equipped weapon and item.
- Alert Status: Indicates if enemies are suspicious (yellow), on alert (red), or unaware (blue).
At Mother Base, the UI helps you navigate different departments, recruit staff, develop weapons, and manage resources. The main menu provides access to:
- Mission Select: Choose your next operation.
- Mother Base: Manage your staff, facilities, and R&D.
- Database: Review intel, character profiles, and mission logs.
- Options: Adjust game settings.
Familiarize yourself with these elements to make informed decisions both in the field and back at base.