Help with relays...

I need a game autoshut off circuit using relays, containing three switches, our prof already provided us with same circuit but only for two switches using two relays, but we need three. Please do help us, the relays also has to be self-latching....thanks in advance

Please provide more information.

Also not that this is your university project, we don't mind helping you but we won't do all the work for you.

Yes, we are not mind readers.