Reported by Pedro De Menezes in a fb post: “Directly plugged into The C64 Mini, the Logitech RumblePad 2 works like a charm. Without the mode button activated, the left and right joysticks work. If you want to use the directional pad, press the mode button (disables left stick). Fire is mapped out to button 1, enter is right shoulder 6. Button 10 is the pop up menu.”
Found here: