Finding Secrets
Secrets in Serious Sam 3 often contain valuable health, armor, or ammo, and sometimes even secret weapons. Look for:
- Suspicious cracks in walls: These can often be destroyed with a few shots or a Sledgehammer swing.
- Unusual platforms or ledges: Sometimes a series of precise jumps can lead to a hidden area.
- Out-of-place objects: A lone barrel or crate in an otherwise empty area might be hiding something or marking a secret path.
- Sound cues: A distinct 'ding' sound often plays when you are near a secret.

Easter Eggs
Serious Sam 3 is full of humorous references. Keep an eye out for:
- Pop culture nods: References to movies, other games (especially classic FPS titles), and internet memes.
- Developer jokes: Sometimes the developers leave behind funny messages or caricatures.
- Hidden characters: You might find blocky characters from other games or familiar faces in unexpected places.
Achievement Hunting
The game's achievements encourage diverse gameplay. Some key ones include:
- Difficulty-based achievements: Complete the game on various difficulty settings.
- Weapon-specific kills: Get a certain number of kills with each weapon.
- Secret finder: Discover all secrets in the game.
- Specific combat feats: Perform unique kills or survive challenging encounters.