You can also see if the coin panel on the front is locked. If it's not, keys might be in there. Sometimes the button for the debug menu is located in the front. It's how you change things like game difficulty and how much money you have to put in to play.
[Written]
You can also see if the coin panel on the front is locked. If it's not, keys might be in there. Sometimes the button for the debug menu is located in the front. It's how you change things like game difficulty and how much money you have to put in to play.