13 maps, various sizes. Most (all?) were released under the name Netmap13. Still good levels... a few have been redone in the Unsavory Tidbits (M2) version. Not new, by any stretch... just new to the site.
A large, convoluted level with lots of staircases and chutes. A little too much use of the safety hazard texture, but other than that, a very nice map.
When people talk of "Total Conversions" of the Marathon universe, Trojan is one of the names that should come up first. Trojan is a complete replacement for the Marathon package-think of it as an action game that happens to use the Marathon engine.