Unlock Cheat Mode
At the Main menu begin a game and select the 'Journey Begins' scenario. Move the arrow onto a tree and press 'X', do this on every tree in the level and then press 'Start' to display the 'Options' screen. If you have done this correctly the last option will be 'Cheat'. This is a cheat menu with options for Maximum Mana and ALL Spells and buildings.
We have more cheats and tips for this game here, Populus: The beginning cheats
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