This is a short but quite fun little map, of a few small rooms and two bigger arenas. It starts slow, gets busier each room, then the penultimate big battle, then the finale which is a hard push for less than 3 players.

The hard part is not blowing yourself up, due to appearing in tight spaces full of monsters and having to fight close-quarters in amongst hordes of monsters.. but if you can manage to make it to the store-room then an arsenal awaits collection. If you get stuck, there's a breakable part of the shelving near the door, inside the main storeroom.

Beware of those storeroom doors - they wait for you to pass through then try their best to crush you.. for reasons unknown.

There's a nasty (well made) trap in the arenas, and that is the double pipes on the floor - they exploit a nasty bug that sticks the player in between them, making the trapped player easy prey for all the monsters in there - so keep jumping over the pipes, don't land/walk on them, and if you get stuck there you can use gauss-jump to free yourself. Again, the hard part is not blowing yourself to bits!

If you make it then well done! You get to pet the friendly monsters in the Xen zoo. Or explode them utterly, as you choose.