Single player, by 
Back in 2001, when I was brand new to JCS, I made a little precious level. The tileset was Damn 2 and I think the title was “Turtle Nightmare” or something similar. It was a few rooms on a linear path with all sorts of powerups and ammo; no doubt inspired by the final level in Quake. For my third or fourth level ever created, it was pretty good looking, because there were few tilebugs (I hated tilebugs 10 years ago and I still do now), and the path was varied, with some slopes and bridges and even some eyecandy like arrows or the tree stumps thrown here or there. At the end of the path stood a signpost, with a rather curious text string saying: “Did Devan Shell violate the copyright by cloning himself?”. Considering what’s happening in the world right now, with all sorts of crap like DRM and VeVo and region-locking, I think that joke was a bit ahead of its time.
The punchline, however, was dropping down into the final room and seeing it literally fill with Devan bosses to the brim. I always had a kick out of it when I’d stand on a platform above the (roughly 100+) Devans and try to snipe them with Seekers. It was a bit funny to see the missile flail around after its target like mad. You could also jump into the horde and try to knock them out from the map with TNT, and then when you’d run into the opposite side of the room, some would appear back inside! The best thing, however, was when trying to leave the arena and restock, there would be more bosses appearing at where the powerups are. That might have been the ‘nightmare’ part of it but I’m not sure now. All in all, it was a pretty crap level, but it was original, and most certainly winnable without cheats. I’d probably rate it like 1.8 or 2.
This level isn’t as good though.
(I lol’d, but this still doesn’t defend your score in any significant way, as is required for non-quick reviews. Rating clearance. ~Violet)