A huge arena surrounded by rising hallways. With big groups, this might be fun, but smaller groups would have a hard time getting close enough to kill. There's a switch in the central pillar which I don't understand at all... all it seems to do is make the upper hallways vulnerable from below. Since only those in the upper hallways can flip the switch, it seems, well... pointless. (I suppose it also makes the area around the hill targetable from above... but there is much more freedom of movement down below, so it's more dangerous to those in the passageways.)

A square arena, with a ledge around the outside and a raised square fortress in the center. Simple, but well-designed for flow. The hill (The central fort) is accessible from both the ledge (via a bridge) and the bottom (via a fast elevator). There are a few pillars to use as cover... but more than two people in the game, and staying on the hill is a non-trivial excercise.

An interesting demonstration of a technique that can (usually) weed out the cheaters from those that aren't using cheats in a given solo scenario. It doesn't always work, but it should work enough of the time that you (as a scenario maker) will get much less mail complaining about problems from people who only encounter those problems because they've cheated to a place they shouldn't be. (It was inspired by, to some degree, Jason Harper's Level Detector, and can be similarly used to control where a player goes based on his playing style.) Like others in this genre, most of the information ...

A set of techniques useable by mapmakers attempting to force coop players to bypass areas that solo players need to pass through. Simple, clearly explained, these have some limitations (spelled out in the tutorial), but should work quite well regardless. They are far simpler than either Coop-Only Level Bypass Demo or Counter Revolutionary, both to build, and to use. The platform tags mentioned are the Pfhorte versions, since that's what the author uses. Yet another cool tool to extend the marathon experience...