If you are getting too many black marks from the council, get a level two house, and make the tenants 'the punks.' After a while they should start to complain about a hedge and will give you black marks if you do not drastically decrease their rent. Drastically decrease their rent, and you will receive some white marks. Then put it up again and repeat this until you have no black marks left. Then either replace them, agree to their demands or make them have children. If you continue to do this, you will receive many white marks which can be exchanged for cash. (100 marks for 10,000.)
To activate the cheats you must go to the single player selection (these cheats also work for the network game as well). Remember you can't see what you're typing so type carefully. If the cheats are entered correctly you will hear a beep. Once you enter the game press C and a plus sign (+) should appear next to the date.
speed471 speed up the game in network play worker902 buy worker whenever you want gangster822 convert workers into gangsters anytime you want weapons473 buy any weapon for your gangsters tenants127 select any tenant anytime fences673 build any fence whenever you want loans039 borrow any amount of money from the bank estates131 build any estate without limits houses738 select any house at any time build909 press Ctrl to build houses instantly actions674 use all undesirable actions on easy level gadgets337 build every gadget missions824 use Alt-i to toggle missions off complain840 turn off complaints by pressing Alt-c cadets552 supply police cadets by pressing Alt-p and supply mob bribes by pressing Alt-m teams418 change your team in single player mode map751 play any map with any number of players