A Lambda symbol can be seen obscured by tires. It appears to be locked from the inside, but the house can be accessed via the cellar.

Cache 25/45 ( d2_coast_03): Near the first Thumper, a small house can be found.

Around the next corner is a Lambda symbol marking this location, clearly visible on a red shack at the side of the road. Gordon must use the turbo speed to get across the bridge.

Cache 24/45 ( d2_coast_01): Once he acquires the Scout Car, Gordon must follow the faint track in the sand up a hill and he will come across a gap between a bridge.

Above the archway are some supply crates, accompanied by a Poison Headcrab.

Cache 23/45 ( d1_town_05): The final cache of the chapter is located immediately after the end of the Ravenholm mine shaft.

Deep inside is the cache, as well as a Fast Headcrab. At the top, he must walk to the end of the beam and turn left, where a hole in a roof with a Lambda inside may be seen. Gordon must clear the area of Zombies, from top to bottom, then climb a ladder to proceed atop the building. This time, he'll be shooting Zombies, opposite from Gordon's position. Cache 22/45 ( d1_town_01a): Shortly, Gordon comes across Father Grigori again.Gordon must hop over the fence and head into the enclosed corner. A Lambda symbol may be spotted below a fence. Using the switches provided, he can get atop the car and ride it up. Cache 21/45 ( d1_town_01): Later in the chapter, Gordon will soon encounter car crushing traps.A vent can be broken on top of the leftmost turbine, leading back outside to the associated cache. Upon entering the building, stairs leading to two turbines can be spotted, with a lambda symbol painted next to one. Gordon will have to enter a building in order to turn off an electric grid preventing access to the next area.

Cache 20/45 ( d1_town_01): Entering Ravenholm, Gordon will have to fend of multiple Zombies throughout the deserted town, eventually meeting Father Grigori atop a balcony.While this lambda symbol only denotes a Resistance base, it counts towards the Lambda Locator achievement and cannot be missed. Breen's Private Reserve machine, with a lambda logo to the right of it. The entrance to the lab is disguised as a Dr. Cache 1/45 ( d1_trainstation_05): Upon meeting Alyx Vance, she will bring Gordon towards Kleiner's Lab.The following is a list of all the Lambda caches that can be found by the player in Half-Life 2 they count towards the Lambda Locator Achievement. The lambda is also seen in graffiti and propaganda posters across City 17.ДЄ huge Lambda logo can also be found on the rocket hatch and a smaller one on the button used to launch it at White Forest. The Lambda logo can be seen on certain vehicles, such as the orange van that Dog throws to the Citadel in Episode One although any van-type vehicle, regardless of color, has a Lambda logo under the right tail-light. They are also used to identify Resistance-friendly Combine weapons such as Hopper Mines and Sentry Turrets, seen by the spray-paint on them. Resistance fighters also wear the symbol on their arm bands. They would spray-paint it near supply caches, and resistance bases and safehouses such as White Forest, Black Mesa East, and Kleiner's Lab. Gordon's Lambda logo on his suit and the work of the Lambda Complex became something of a legendary trademark symbol for the Resistance against the Combine, referring to the acts of Gordon Freeman during the Black Mesa Incident, and turning the symbol into an informal logo for the Resistance, reminding of the real world Anarchist symbol, of similar purpose. In the original Half-Life, Gordon Freeman's trademark HEV Suit was marked with a Lambda Logo on the chest, as were other HEV Suits, due to their use in the Lambda Complex - a section of Black Mesa dedicated to teleportation research - identifiable by the Lambda logo at its entrance.

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