Hidden level:To unlock a hidden level, destroy all statues in the “Valley Of The Kings” level.Achievements:ACHIEVEMENT – HOW TO UNLOCKSerious Beginner (10 points) – Beat any level in single player. Game Master (20 points) – Beat the game. Serious Sam (30 points) – Beat the game in single player on serious difficulty. I am Invincible (10 points) – Beat the game in single player without firing a single bullet or shell. Serious Run (15 points) – Beat the game in single player by beating estimated time on each level. Metropolis King (20 points) – Beat Metropolis level in single player on serious difficulty without loading. Cannon Expert (5 points) – Pierce at least 10 enemies with a single cannonball. Perfect Kill (10 points) – Kill all enemies in Karnak in single player. Look, It