In this level you can test yours skills by going throught 8 waves in a hallway that get significantly harder and harder the further you go.
If you cant find the last 3 enemies, make sure to check behind the first counter you come across, because it looks like every different empty room (except it has colours)
– 8 waves of enemies
-sandbox/beginner room with assault rifles (infinite ammo), laser katanas (unbreakable) etc. (under the big text in the first room)
Level is pretty difficult, so if you are new then using the unbreakable weapons is recommened.
Across the map there is around 5 medkits you can heal with.