How do I use the gun that comes with Robin's Biohazard suite in Lego Batman 2?
Matthew Barrera 
I can get Robin to ready the weapon by pressing the circle button, but I can't get the gun to do anything. How do you use it?
1 Answer
The gun can shoot toxic waste, but it first needs to suck some up before it can shoot it out. Use the action button in a toxic waste pool to suck it up, then you'll be able to fire it out.
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