Cossacks 3 Cheat Mode:

Press Ctrl+Enter – to open Chat/console dialog. Type cheat and press enter again.

Cheats list:

Cheat Code – Effect

showallmissions  –  Makes all missions available.

res %resource% %amount% – Available resource names: food wood stone gold iron coal all
usage:
res food 100000

res all 20000000 (will set all resource)

freecamera – Remove limit on camera height. you can change camera angle by holding Ctrl+middlebutton (scroller) and moving mouse Ctrl+PageUp/Ctrl+PageDown to change camera angle of view. Home key will return camera angle of view to default.

Alternative;

Cossacks 3: The Golden Age Cheat Codes