Portfolio of Shaun McCarty

Level Designer


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Source Engine
Half-Life 2 Episode 2
Single Player
Completed 2009
Total Time: 4 months

Download Rat's Nest (Requires Half-Life 2 Episode 2 to play.)

Download the Level Design Document for this map

Rat's Nest

A fictional event after Half-Life 2 Episode 2


Rat's Nest is part of a fictional storyline that takes place after the events of Half-Life 2 Episode 2, in which Gorden and Alyx's helicopter crashes inside the demolished City 15, separating the two. Gordon is travelling to the outskirts of the city to steal a new helicopter from a Combine base. Rat's Nest occurs as he travels along shipping canals to escape the city center. After shaking off the pursuing Combine forces by floating down a drainage pipe on a makeshift boat, he ends up outside a large shipping warehouse with his craft leaking water. With no transportation, he must explore the warehouse for anything that might help him continue his journey.

In Rat's Nest, Gordon must team up with a former City 15 Resident nicknamed Nineball, who has similar goals of travelling downstream. Together they work to construct a functional boat, while fending off the Combine who continue to eagerly try to end Gordon's journey (not to mention his life.) A majority of the map focuses on two new gameplay elements introduced; a magnetic gantry crane, and a rail shooter style turreted fanboat.

Using the Crane, Gordon must solve a variety of puzzles, ranging from simply moving a container blocking a door, to fending off waves of Combine soldiers using only the crane and any metal objects in the warehouse. While manipulating the crane the player is rarely in any real danger, ensconced in a control booth surrounded by reinforced glass. Only if the player fails to repel the attackers can they break through, at which point an old chair makes an excellent weapon.

Once Gordon joins Nineball on the completed fanboat, the danger level increases somewhat, as they are both exposed on the water while Combine vehicles pepper them both with rockets and and scattered soldiers take potshots. This isn't a large concern though, since Nineball's driving, and Gordon gets to man a rocket turret she rigged up to the boat as they race through the waterways.



Upon crawling out of his sinking craft, Gordon looks back at the industrial region atop the hillside where he escaped from. The large drainage pipe juts out from the rock wall, dumping refuse into the basin below. Smaller pipes from the industries above used to dump miscellanous chemical wastes, now they lie empty and corroded.

The majority of the action takes place here, in the control room. The crane console in the center controls the crane seen on the right of the far wall, while a lone chair offers a final defensive option.

The gantry crane is not for the inexperienced; manipulating it correctly takes a steady hand and a sharp eye. Wantonly dropping it can pick up more objects than intended and cause them to careen wildly to and fro...but then again, what better way to mow down rows of advancing Combine soldiers?

The loading area of the Warehouse is not as fortunate as the storage area. A sunken ship lies in the silt, the water level long since lowered. Broken lights send crazy shadows when nudged, and rusty crane cables drape loosely, the magnet embedded in the dirt below. The fanboat sits under construction on the platform, awaiting engine installation.

This warehouse mostly stored industrial goods, which conveniently were mostly metal products of various types. Supplied by rail, a leftover container hauler lies idle on the tracks. Gordon does all of his work from the control room on the far wall, with the warehouse office down below.

A Combine train lies in wait on the old bridge, with two Combine armored vehicles parked atop flatbed cars. The setting sun in the background starkly silhouettes these targets and the old transmission tower on the center island. There's not much water left for most vessels such as the fishing boat beneath the bridge to float, but more than enough for a 2-person rocket-launching fanboat!

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