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...