Having just read the other replys, most of them are wrong. There is a knack to playing cops and robbers and if only play it when you should and play it properly then you are almost guaranteed to come out in front. The person who "drops it" and then walks away has lost hundreds of pounds to the next people to play the machine. There are other machines that you can almost guarantee coming out in front if you know what you are doing. But you must know the history and sure you are playing it at the right time, failing that you must have the funds and time to continue playing to minimise your losses. These are not cheats, just playing strategies and of course there are different strategies for different machines.
be careful !