In Space Marshals 3, the primary objectives involve completing missions by strategically eliminating enemies, collecting equipment, and utilizing stealth tactics to advance through levels.

To change weapons in Space Marshals 3, tap on the weapon icon on the screen. This allows you to select different weapons from your inventory depending on the current situation.

To succeed in tougher levels, focus on using cover, employing stealth tactics to avoid detection, and planning your attacks carefully to manage enemy confrontations effectively.

To unlock new characters or equipment, complete missions and challenges to earn experience points and in-game currency. Check the shop or character menu after earning enough points.

Using stealth effectively involves staying out of enemy sightlines, hiding behind objects, and timing your movements. Follow these steps to enhance your stealth play:
1. Observe enemy patterns and routes.
2. Use the environment for cover.
3. Move quietly while avoiding detection.
4. Engage enemies only when absolutely necessary.