This ain't Mars. Well, it has the same layout as Mars, and it's a pretty nice map in its own right, but it ain't Mars... The carnage pit is now a (very deep) pool, brightly lit. The upstairs is open to the air, with vistas... The compilers in the water are pretty cool, but it ain't Mars...

OPE is a quick way to add/remove different aliens on the net levels. Easier than doing the same thing with Mia or MME. This version fixes a few bugs.

The last version for Marathon 1. Changes aren't documented, but seems to be mostly pallette changes (there's now a Texture popup!). If you've got the space, definitely worth having around.

3 maps. Nearly impossible solo (too many aliens, not enough hiding places), but some nice flow mechanisms for net play.