Serious Sam 3: Co-Op Playthrough on Mental Difficulty - The Lost Temples of Nubia

In this mission, we start just after a Biomech shoots down our helicopter, and we lose all our weapons. We spend the first half of the mission getting them back, then the second half fighting millions of enemies, including the dreaded Kleer, edging our way to victory. We also start this mission with a third, and later on gain a fourth. This team sticks untill the finale.
Serious Sam 3: Co-Op Playthrough on Mental Difficulty - The Lost Temples of Nubia