Age Of Empires II: Age of Kings Easter Egg - Discovering the Empires Deserts

1.Start a game in the William Wallace's tutorial.
2.When the game starts, press [enter] and type MARCO. Press again [enter]. You have just revealed the map with a cheat.
3.If you are playing (see 1.) a tutorial game (excluding Battle of Falkirk), you will notice that the part of map that normally you can't see is a desert. In one of these tutorials there is a HELP written on the desert with the hill creator of the editor.