Use the key given for the Gotham City passwords.

Password	Effect
JD JR BL JD	Axis Chemical Factory level 1.
BU BL JD JD	Axis Chemical Factory level 10.
BR BL BU JD	Axis Chemical Factory level 11.
JL BL JD JD	Axis Chemical Factory level 12.
BU JL JR JR	Axis Chemical Factory level 2.
JD BR JL JL	Axis Chemical Factory level 3.
JU JL BR JR	Axis Chemical Factory level 4.
JD JR BU JU	Axis Chemical Factory level 5.
BU BU BR BU	Axis Chemical Factory level 6.
JD JL JL JU	Axis Chemical Factory level 7.
JU BU BU JL	Axis Chemical Factory level 8.
JD JL BL BR	Axis Chemical Factory level 9.