Required Tools :
• Firefox/Chrome
• Cheat Engine



Credits: 1rvan7 Working as at 12/2/2011
Steps : 

1. Enter Millionaire City [play now]
2. Open Cheat Engine.
3. Select browser in process list.
4. Go into Shop > Commerce and notice that the Coffee Shop cost 100000.
5. Scan 100000 in Cheat Engine.
6. A few addresses returned. Select the ONE address that ends with 20.
7. Change the ending value of 20 to 4C+10.
8. You see that the value is 2.
9. Change the 2 to 50.
10. Now buy a coffee shop. When you hover on it, notice that ALL your houses are highlighted. The cheat has EXPANDED your income area to the entire map. So the more houses you have, the MORE money your coffee shop gives you. Houses must have contracts, duhs. 
11. Watch my video if you are unclear.