The first two levels of a rather large scenario. (All the levels are there, but only the first two have polygons in them... well, the third has a pair so that you can teleport in, but...) Generally pretty difficult, but more for techical reasons than anything else. The central shaft on the first level (by which most intra-level travel occurs) is a bit tough to get the hang of. Once you've figured it out (and ignored the bad textures inside), it's pretty cool... and there's a nice trap on level two.