In this gameplay walkthrough of LEGO Batman: Legacy of the Dark Knight for IGN, we show you how to get through the Firefly section of Chapter Four.00:00 - Intro00:05 - Batman: The Animated Series03:30 - Go to the Gotham Museum04:35 - Million Dollar Masquerade Ball06:05 - Open the security door07:21 - Save the partygoers 1/308:06 - Save the partygoers 2/309:35 - Save the partygoers 3/311:56 - Investigate the banging doors12:42 - Follow Firefly through the museum14:51 - Save the partygoers17:20 - Build a cannon19:10 - Find a way to open the door19:30 - Red Brick: Fire Breather21:44 - Fuel the rocket 1/222:52 - Fuel the rocket 2/224:40- OutroFor more help on Lego Batman: Legacy of the Dark Knight, check out all of our guides at https://www.ign.com/wikis/lego-batman-legacy-of-the-dark-knight