A 6-level (well, a few more, but who's counting) map containing tutorials on making a slew of cool effects in Marathon. These range from trivial (more realistic smoke contrails via a single change in the physics model entry) to seriously complex (swinging doors, breaking windows, exploding walls). You even get tasty bonuses like a real laser sight and a working flashlight (this is too cool for words). It's all described in easy-to-follow language, and shows off some of Chris's amazing Killing Time artwork. Absolutely worth a download, for all scenario makers. Upgrade adds curved archways, ...

Small & fast map with lots of altitude differences. MOTM Jan 2001.

Otherwise known as Marathon 1-2-3 Converter, this tool will convert M1 data files (maps, shapes, sounds, you name it) to Aleph One format. It's more than just a simple translator - when you tranlsate a map, you also get the MML files needed to make it work as the original. Source is included.

24 levels, some simple, some more complex... all quite playable for small to medium groups. Emphasis is on movement... and it works well. With 24 maps, your net group shouldnt' get bored too quickly...