To unlock maps, follow this instruction. Enter one of the following code at the map screen.
yukiisnice: Trading Caravans
aricanshoot: Race against Time
heliasiswise: Money or Life
kalaisevil: Flee or fight
ericisdead: The Great River
drakeisahero: Battle of Theley
dariohasabird: Unknown Land
kerberosisgone: Flooded Land