14 levels. On the whole, these are really nicely done. Many are variations on a theme (one map will be a vacuum level, another the same level with oxygen). There are a few bugs, but no fatal ones, and the general quality level is quite high. No docs.

Desert Levels. Great textures (first water I've seen outside of the M2 preview), and enough baddies that these levels work equally well as solo (explore) levels and net (kill) levels. The patch affects different texture sets than Bob World Headquarters (see above), so they can both be applied to the same Shapes file. This is now Rev 1, with a few textures fixed.

New shapes, physics, and a map that turns Marathon into a shootout in the old west.

A pretty nice net level if you stay in the center arena, but it gets hellish if you enter the outside passages...

Kind of nasty. Lots of ways to die... Personally, I found it distracted me from the true point of a net level (killing your friends), but some folks like this. Well-constructed, anyway.

A little strange-walls hanging here and there, doors designed not to open, enemies you can't get to-but for a small game, the flow should be okay. (Update is mostly tweaks.)

A bunch of staircases out in the open. Good for killing folks who haven't mastered the art of looking up or down.

A big, rambling level. Plays pretty well as a solo level, too.

An interesting shapes editor that allows editing of the shapes from within the program.