Players will arrive at the entrance of the subway after leaving a short tutorial area. They will follow the only path available to them, down the stairs to the first mechanic which introduces acid pools as a hazard, and chemical barrels as a way to diffuse the pools.

After continuing down the escalators, the player will find a train blocking the path ahead and a collectible "breadcrumb" steering them to a control room on the right. The generator inside must be repaired with a power cell that can be found by passing through the train into the collapsed tunnel.

Once the player restores power to the station, they can move the train out of the way, but another train is blocking the path on the other side of the center platform. Players will need to remove debris from the tracks to be able to move this second train. After this train is moved, players will need to cross more acid and crouch into a hole to reach the supply train.

The player will load 4 boxes of supplies onto the train, then ride it through a blockade at the end of the tunnel. This level ends slightly after 4 minutes and leads to a level created by another designer.