One Way Passage

A simple way to make a one-way passage without using any drops, is by placing horizontal accelo-rings in the doorway.

This way other players in your realm will be able to enter but not exit a specified part of the land. It may also be used to make trap rooms in mazes and obstacle courses from which there is no escape apart from the leave button which will wipe their way-points.

An example of a passage like that is shown on the picture below and I hope you will have tons of fun with this technique. (Click to zoom in) -