Type the following phrases on your keyboard to activate the cheat.

cashmon = +$100,000
lvup = +1 level
myland = Unlock allland
2slow = Fast build
w3lcom3 = More pedestrians
roadrag3 = Fast cars
punish = z for lightning

These cheats are listed in the game's settings once you pass level 100 but they can be used at any time on any difficulty. Enjoy.