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Glad you’re enjoying the game!

I’m not familiar with that joystick, but there weren’t a lot of them that worked with the C64 second button.

You can also trigger the same function by plugging a second joystick into port 1 and pressing fire.

Ah - so it's a second joystick that is used for the game.  Now I understand - thank you.  Further research has indicated that the second fire button on the Epyx/Konix 500XJ only works with a Sega Mega Drive and the NES.  So not the C64 sadly :(