Enter codes at the main console in the Batcave. Note: These codes only make the items available for purchase. You'll still need enough studs to buy them.

Effect	Code
Heavy Joker Goon	ZQA8MK
Joker Goon	9ZZZBP
LexBot	W49CSJ
Poison Ivy Goon	M9CP6L
Riddler Goon	Q285LK
Two-Face Goon	95KPYJ