Completion Strategy:

You're in the Nightclub, with Marco and Braces, and you have to score 20 kills before the other team does.
Sound easy? You betcha'! Just grab the Tommy Gun and watch the radar for any opponents, and kill them quickly.

- Lenny

Platinum/Fast Time Strategy:

The key to a fast time or platinum, is quick reactions.
Because this level is so cramped and has many corners, you'll have to watch the radar carefully to see where they might appear.
Sometimes you'll turn a corner, anticipating that they're there, but they're actually a level below you, or above you.
When you start, quickly grab a Tommy Gun, and only the Tommy Gun (don't waste your time with any other weapons), and make constant kills.
If they go outside up in the balcony, it's going to be hard to kill them.
A, it's nightime, making it hard to see them, B, the actual balcony also makes it hard to see them, and C, they're going to use the TNT (sometimes).
And don't bother going for the damage icon, because that item is also on the balcony, and it wastes a couple of seconds.

- Lenny