Serious Sam: The First Encounter Part 2/7 - Levels 4-6 - Serious Difficulty

Serious Sam: The First Encounter is a game released by Croteam in 2001.
Serious Sam is one of the first games I have ever played. I was maybe 3-4 years old when I first played The Second Encounter. This series is me showing off my two decades of Serious Sam experience and it will cover both of the classic games, The First Encounter and The Second Encounter and will be included in two separate playlists.
Timestamps:
00:00 Valley of the Kings
19:27 Moon Mountains
33:20 Oasis