John
omg, devnull is buggy! oh noes D:
that's a phantom level, after mines' end - it's still there due to a
bug, initially it was the grue challenge level, but it was moved to a
separate branch, and the level after mines' end was left there,
unaccessible except with trapdoors or level teleportation
It's a bug (generally called the "undermine" apparently) in the Grue
Challenge. It's amusing that you hit it on the Australia server
yesterday, since I fixed it on all the others yesterday.
-robin