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Valve

Portal 2: Peer Review includes an additional course for Portal 2 co-op campaign, dubbed "Art Therapy"; as well as Challenge Mode for both single-player or multiplayer campaign, where players can play specific levels and compete in friends/worldwide leader-board.

Valve, Filip Victor

A completely free and extensive community-developed update for Half-Life 2 featuring beautiful lighting, countless bug fixes, and a brand new Community Commentary Mode. With Half-Life 2: Update, there’s never been a better time to revisit City 17.

Valve

"The Last Stand" is a "campaign" exclusive to Survival Mode. It was introduced in Survival Pack—the first DLC for Left 4 Dead.

Valve, Telltale Games

A hidden Steam game that was made to demonstrate Steamworks API.

Valve, NVIDIA Lightspeed Studios

Break the laws of spatial physics in the hilariously mind-bending adventures of Portal and Portal 2! Including Portal and Portal 2, the Companion Collection comes with all the groundbreaking gameplay, dark humor, and exploration that earned the series hundreds of awards.

Valve

This DLC is a port from Left 4 Dead, adding the campaigns The Sacrifice and No Mercy. Initially, it was to be released for the first game alone, but since players would have to own Left 4 Dead to experience the events that explain The Passing, the developers opted to release it for both games. No Mercy was brought over as well because it was the most popular campaign. Both campaigns are available in every game mode. Players will still control the original Survivors, but will find items and Special Infected from Left 4 Dead 2. Five achievements were added, as in Left 4 Dead.

Valve

Portal: Still Alive is a retooled version of the original smash hit first-person puzzle game, with additional levels and challenges. As unwilling test subjects in a sinister laboratory, players must break the laws of physics using 'portal' technology to solve puzzles and survive. Featuring a darkly comic story that weaves adventure with brain-bending puzzles; 'Portal: Still Alive' also introduces 14 brand new bonus puzzles to challenge even the most skilled test subjects. Players can also get a glimpse into the making of 'Portal: Still Alive' with commentary from the developers.

Valve, Turtle Rock Studios

The first DLC for Left 4 Dead 2. Entitled "The Passing," players will control the new Survivors as they meet up with three of the original Survivors from Left 4 Dead in a campaign that takes place between Dead Center and Dark Carnival. A new firearm, the M60, and a new melee weapon, the Golf Club, appeared, along with a new "Uncommon Infected," the Fallen Survivor. New Survival, Versus, and Scavenge maps were made available. It was released April 22, 2010.

Valve

The Sacrifice" is the prequel to "The Passing," and takes place from the Left 4D Survivors' perspective as they make their way South. We know Bill dies in "The Passing" but how and why? You can read the comic to find out the official version of events or this October 5th you can play the game to choose your own ending. In The Sacrifice for Left 4 Dead, gamers receive the complete Sacrifice campaign with maps playable in Campaign, Versus, and Survival. There is a new style finale and plenty of places for devastating Hunter pounces. For Left 4 Dead 2, gamers receive "The Sacrifice" campaign and L4D1's "No Mercy" both playable with the L4D1 Survivors. Each campaign is playable in Campaign, Versus, Survival, and Scavenge modes and both feature the Left 4 Dead 2 Special Infected, items, and weapons. Yes, Zoey with a chainsaw!

Valve, Sierra Entertainment

1998. Half-Life sends a shock through the game industry with its combination of pounding action and continuous, immersive storytelling. NOW. By taking the suspense, challenge and visceral charge of the original, and adding startling new realism and responsiveness, Half-Life 2 opens the door to a world where the player's presence affects everything around them, from the physical environment to the behaviors even the emotions of both friends and enemies. Half-Life 2 Collectors Edition Box Content: - Game - T-Shirt - Hint Book

Valve

Prospero was one of Valve's first game designs, slated to come out shortly after Half-Life.

Valve

The Gold Rush Update, also referred to as the Medic Update, was the first major content update for Team Fortress 2. The update centered around the Medic as the first class to receive three new weapons that provided alternate means of gameplay. Alongside the introduction of these weapons, the Character Info and Loadout system was implemented to allow players to equip the different weapons that would come in later updates. The update also detailed the introduction of the new Payload gamemode, the related titular map Gold Rush, and the release of Meet the Scout. Numerous improvements and additions were also included.

Valve

Mann vs. Machine is a new co-operative game for Team Fortress 2 that lets you and five friends wage a desperate battle to stop a lethal horde of robots from deploying a bomb in one of Mann Co.’s many strongholds. Take advantage of breaks between waves to upgrade your abilities and weapons. Survive all the waves in any of a variety of missions to earn incredible loot.

Valve

The Pyro Update was the second major content update for Team Fortress 2. The Pyro class was the focus of this update. In addition to three new weapons, the latent Hadouken taunt was upgraded to become the first Kill taunt. The update also added compression blast to the Stock Flamethrower, an ability that would become a core technique for the class. Two community-made maps, Fastlane and Turbine, were made official and included in the update, along with a link to the Valve Developer Community site. Meet the Sniper was also introduced in a similar manner to Meet the Scout. Additionally, many improvements and fixes were included.

Valve

The Heavy Update, officially known as A Heavy Update, was the third major content update for Team Fortress 2. The focus of the update was the Heavy class. As was customary, three new weapons for the class were revealed, and the slowdown mechanic was introduced. To accompany the Sandvich consumable weapon, Meet the Sandvich was released alongside the update. A new game mode, Arena, was introduced. It focused on combat between the two teams and brought five new maps to the game. Two other maps, Badwater Basin and Steel, were also included.

Valve

The Scout Update was the fourth major content update for Team Fortress 2. The update was mainly focused on the Scout. In addition to three new weapons, the class gained several unique voice responses to his new weapons and gameplay events, adding further immersion for players. Three community-created maps (Egypt, Watchtower, and Junction) were established as official due to their outstanding quality.

Valve

The Sniper vs. Spy Update was the first two-class patch and the fifth major content pack released for Team Fortress 2. Initially at the center of the update was the Sniper class, and the day by day progress went smoothly. An announcement on Day 4 revealed that the Spy would also benefit from the update. Each class was given three new weapons along with achievements.

Valve

The Classless Update, officially known as The First Ever Classless Update, was the first non-class specific major update. The content focus of the update differed from previous updates; instead of introducing new weapons or achievements, the Classless Update added new cosmetic items, game modes, and maps, while also delivering numerous bug fixes and minor tweaks to existing gameplay.

Valve

The WAR! Update was a class update for the Demoman and the Soldier. It was the second multi-class patch, and was the sixth major content pack released. The WAR! Update differed from previous updates by including two competitions, operating inside and outside the game. The first was announced at the start of the update; a kill tracker appeared in the HUD of anybody playing as a Demoman or Soldier, with the counter increasing each time they (as a Soldier) killed an enemy Demoman or they (as a Demoman) killed an enemy Soldier. The personal totals of each player were added to a mass tally, and with each day of the update a running total score for each side was displayed on the update page. The Soldier won with 6,406,065 total kills to the Demoman's 6,372,979, granting the Soldier the prize of an extra unlockable weapon, the Gunboats. The second competition was the Propaganda Contest. Users were encouraged to design propaganda posters for the side of their choice, supporting either the BLU Soldier or RED Demoman. The posters were then submitted to Valve to be judged through the Propaganda Contest website. The three leading prizes were later revealed to be J.Axer's Dapper Topper, Amber's Rad As All Hell Hat, and Uncle Sam (for first, second, and third place respectively).

Valve

The 119th Update was a major update released on April 29, 2010 Patch. The update was released in order to celebrate a notable milestone; the release of 119 Team Fortress 2 patches.

Valve

The Mac Update was the first major update for Team Fortress 2 that included support for a platform other than Windows. its main feature was providing the ability to play the game on macOS machines. The update also included a Training mode and its associated map Target, added help sections to the Loadout, Backpack and Crafting screens, and also completely overhauled the main menu. The patch also added the ability to play King of the Hill maps and Dustbowl in Offline Practice Mode against bots, and made a number of other minor changes. After the update went live, the Mac Update trailer was released as was a non-canon Apple-themed comic strip featuring the Soldier, Scout, Heavy, and Saxton Hale.

Valve

The Engineer Update was a major content update focusing on the Engineer. Rather than announcing new content for the update regularly, new content was announced every time 25 Golden Wrenches were found. With 100 Wrenches to be found in total, there were 4 announcements prior to the final release of the update.

Valve

The Mann-Conomy Update was a major content patch for Team Fortress 2. In total, the update added 65 new items including community-contributed content from the Polycount Pack contest, new Cosmetics, weapons, Unusual effects, mini-games, tools, crates, and packs of cosmetics and weapons. The update also introduced the Mann Co. Store, Steam Wallet, and microtransaction system as well as item trading.

Valve

The Second Annu-Hell Scream Fortress Hauntdead Halloween Special, then also commonly known as the Scream Fortress Update, Following the previous year's Haunted Halloween Special, the celebration established the annual Team Fortress 2 Halloween event.