When you play a level press on enter. You now get on the bottomline
the possibility to enter a message. Enter "corwin of amber" and press 
enter. You will now see that the cheats are enabled. The following
cheats get be enabled now by typing in the following cheatcodes in the
same way as described above.
 
"there can be only one"  All own troops are invunerable and can only be killed
                         with the firestone-thrower.
"hurry up guys"          Buildingtimes are speeded up.
"sally shears"           The whole map will be shown.          
"iron forge"             All technologies are available. 
"eye of newt"            Magier have total knowledge.
"pot of gold"            You get 10000 Gold and 5000 Wood.
"ides of march"          Shows final sequence of the level.
"crushing defeat"        You lose the level.
"yours truly"            You win the level.
"Human1, Orc1, Human2,.."  Enter specified level.