How to beat Poison Ivy

First, destroy the plant monsters that pop up. Then, there will be plants shooting poison off to the sides. When the plants open to let the poison shoot out, use your batarang on the center of the plants. Build the objects that appear after the plants are destroyed. Have Robin put water in his suit from the fountain in the top left corner then shoot the water onto the green slime puddle in front of the handle that batman has to pull until the slime is gone. (You built the handle from when you destroyed the plants and built the pieces that fell from it). Have Batman pull the handle then build the lawnmower out of the pieces that fall. Then go over and Turn the wheel that the lawnmower reveals. And presto! Poison Ivy disappears and you have to beat Catwoman! Good Luck and I hope this helped!