You need a specific character such as Bane( I think), The Joker, Killer Croc, or Poison Ivy. I really don't think that there are any suits for Batman or Robin that let them tred in the toxic waste, so if you want the minikits or red power bircks then you need to freeplay.
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There currently isn't a Lego Batman 2, however a Lego Superheros game is said to be released later this year (2012).
type in goggle Lego batman cheat codes and find the code for min kit detector
beat the game
no
it is a mini game