Cheating is ungodlike and shows both a lack of integrity and intelligence, it is etched in the stones of the circle of reincarnation and misfortune will befit all those who defy it. Cheating is practised by only the lowest form of pond scum. But here they are anyway:

Populous The Beginning

Press [Tab] + [F11], then type byrne and press [Enter] at the window that appears to enable cheat mode. Now, type in the following codes whilst playing:

[Tab]+[F1]
More Mana
[Tab]+[F2]
Free spells
[Tab]+[F3]
All spells
[Tab]+[F4]
All buildings
[Tab]+[F5]
Max Mana

Populous 1

World Names

Populous 2

Go to the menu CREATE YOUR DEITY, load your character and for password type in DKNPJAEEMEJMNMFAFDOD
Now go to the CONQUEST menu and type in the name of the last level you played. Now you should have full energy.

To get a god with maximum power type the following cheat at the CREATE YOUR DEITY menu KOPOJAEEMEJMNMFAMEON

Enter the "World Options" menu selection whilst playing. Enter ITCHY SCALP as
a code and press [Enter]. Return to the game and press M to increase the mana.

Select conquest game and enter a password for a level with lots of powers such as TIOW. Click Cancel and then custom game. Now you will have all those powers available in a custom game.

World Names