Find The Cheats MINIKIT Detector, Stud Magnet, And Sutds 10x. Then You Have To Pick A Mission. When You Get In The Mission Pause The Game Then Go To Extra(s). After That Switch Them On. And Then You Should Find All The MINIKITS.
An easy way to get about 100,000 studs is to go to the batcave. Go to episode 1 and pick two face chase. Destroy lots of stuff and youll get studs fast. Destroy everything you can. When you get to two face look around both of the police cars and there should be 3 blue studs and two purple studs.