1-Go to workshop
2-buy a tower(smal,medium or large)
3-buy a weapon(neil,dagger,plow,razor dicks,flame tower,glue,oil,armour regenerator(I suggest this weapon)....
4-go to sell part with a weapon
5-don't sell the weapon
6-go to paint shop(on the top of the right corner)
7-when you see the hand click it)
8-It shows you sell weapon
9-press it press it press it press it press it press it press it press it........
10-then look at your credits