Research Base coop/skirmish addon

This is coop Research Base Pt.1 with only alien NPCs.

Normal - medium amount of aliens.
Easy - less aliens, animated textures slow them.
Hard - more aliens.
Extreme - no jetpack.

If you have trouble learn where the weapons are and find where the aliens don't attack. If you like a challenge try to find all the secret items.

Jetpack/grapple are on as the lifts only work for the host in multiplayer. The secrets can be gotten without jet/grapple.