Renegade

Similar to Berzerk, Renegade requires you search a 10-floor maze for a precious crystal located on the top level and make your way back down with it again – in your path are a number of highly armed guards, and you must find a special object on each floor that will allow access to the one above.

As well as objects that will help you, there are others that will completely rejigger the maze and can sometimes result in leaving you trapped. Guards can be dispatched with your gun or you can simply avoid them.