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10 G

This is not without its challenge if you are playing on Hard. As soon as you're coming out of the tunnel beside the entrance to Arkham West, you'll see four goons outside of a door with a guest list in their hand (after Joker has invited you to the party).

Beat them up and once you go inside, you'll see a small space and about 20 guys, meaning that on hard, you can die quick if surrounded.

I planted three explosives on the ground throughout the room before attacking so that when people moved, most of them were stunned, allowing me to finish 4-5 guys right away. The rest is just about masterful countering, combos and dodging.