O.K. so in some online instructions for Coinops 6, it says:
BACK and WHITE - Save State ( CONSOLES Only )
BACK and BLACK - Load Saved State ( CONSOLES Only )
So I'm not sure what is wrong or if it's just that game (because although it's counted as a Mega Drive game, it was never actually released on the console) but I can't seem to save or load states.
Any ideas on that specific game, if it's any different etc.? I've not tried to use save or load states on any other games yet so I have no idea.
Save states on this specific game would be great though, so it would actually save what unlockables you have between games!