Feel like getting around in a hurry? Hop on the Metro and prepare for the ride of your life. In this map, which takes place in a high-speed mass transit rail station right in the middle of Zurich, you'll find a lot of aisles to run down, both on the outer edges and right in the center of the room. This can be tricky to get around, as that means you'll be in consistent conflict with opposing enemies. It's small, but quite a sufficient setting if you want to rack up the kills.
Even though the routes are somewhat open, there are a lot of things to hide behind, so take the time and flank opponents with your team, and keep your weapon at the ready. Also have a defensive item or two set in place around the center, as they'll be useful when the enemy comes a-knockin'.