Basically what you are seeing is a simple dungeon segmented into a few rooms. At the door of each room is two triggers. One trigger spawns the monsters, the second trigger runs a script function for that room.
You can find documentation on how to do this in link found in the video description.
@HwBxMoDzZx The current experimental builds of Bukkit have started to enforce permission checking for commands. You will need configure permissions for your server in order for the commands to start working again. Hopefully the recommended build of bukkit for 1.8 will make that functionality co...
@SchlingelBengel The dungeon creator chooses the allowed party size