Buy Cash Item with Coin and Quick Expand

Tool: 
Cheat Engine
Tutorial:
1. Open Cheat Engine, in the Value Type chose Array of Byte. First scan 40 42 0F 00 40 42 0F 00 00 00 00 00 , select all the addresses and using red arrow drop them down select all and right click on those highlighted addresses and from menu change record type and change length to 16 you will see 4 new bytes added to the string: 40 42 0F 00 40 42 0F 00 00 00 00 00 XX XX XX XX (where XX is your own result)

2. Now make new scan 36 00 00 00 36 00 00 00 00 00 00 00 and repeat the same operation you made in the point 1 and you will get 36 00 00 00 36 00 00 00 00 00 00 00 YY YY YY YY (if you get many results all different, select 3 or 4 the same)

3 Now take 4 bytes YY YY YY YY you got in the point 2 and make a new scan of them 
and change the value of your YY YY YY YY to XX XX XX XX 

4.Now go to your market and click any cash item you can by with coins