PHP/MySQL based implementation of a persistent virtual world made up of unit rooms where each room is either transparent or solid. You can move in any of these 6 directions: north, south, east, west, up, down. Each move is considered to take exactly one room and you can move only through transparent rooms.  When in a room, you can see a description of the room and anything or anyone else in that room. Other adventurers also live in this world and from time to time, you can bump into them.