Half-Life: Blue Shift

Half-Life: Blue Shift is the second stand-alone expansion pack for Half-Life, developed by Gearbox Software and released on June 12, 2001. Like Gearbox's other expansions, Half-Life: Opposing Force and Half-Life: Decay, Blue Shift returns to the setting and timeline of the original story, but with a different player character: the ubiquitous Black Mesa Research Facility security guard Barney Calhoun. As Barney, the player attempts to escape the alien invasion caused by the resonance cascade and the ensuing military cover-up.

Blue Shift has now been released via Steam and anyone with access to the back catalog, whether through an old copy of Half-Life or the Silver or Gold packs of Half-Life 2, may download Blue Shift for free. A third-party remake of Blue Shift for Source, called Guard Duty, is under development.

Overview
The Blue Shift package offers the Half-Life High Definition Pack as an option at the time of install. The pack includes updated 3D character, weapon and item models, often increasing the polygon count 10-fold over the 1998 originals. The U.S. Blue Shift release includes a full, stand-alone version of Opposing Force, but the international edition has the multiplayer-only Opposing Force CTF.

Blue Shift started out first as an exclusive part of the Half-Life Sega Dreamcast port. Due to Sega pulling the plug on the Dreamcast, this version was cancelled only weeks away from release (the Dreamcast Half-Life port has since been leaked onto the Internet, with both Half-Life and Blue Shift fully playable). Gearbox then turned the project into a stand-alone product; unlike Opposing Force, it does not require the original Half-Life.

Although fans of Half-Life were eager to play more of their beloved game, many complained that Blue Shift did not measure up to the high standards set by the Opposing Force expansion. The game offers some new levels and areas of Black Mesa previously unseen in a relatively short new campaign, but no new weapons or enemies, as Opposing Force offered. Aside from the High Definition pack, the only new content was a character named Dr. Rosenberg, a Black Mesa scientist who has his own unique character model and played a major role in the story, and alternate scientist and security guard models wearing civilian attire. Blue Shift reviews were very poor in comparison to other games in the series.

On August 24, 2005, Blue Shift became available for download via the Steam content delivery program. Anyone who owned an old copy of Half-Life, or the Half-Life 2 silver or gold packages (thus, having access to the back catalog) could download it for free. Since then, access to Valve's back catalog for free after registering a previously owned copy of Half-Life has been discontinued, and Blue Shift must now be bought either alone, as part of the Half-Life 1 Anthology, or as part of the Valve Complete Pack. The High Definition Pack is also available via Steam.

However, the Steam port suffers from numerous issues, most probably because the GoldSrc engine used in the game has been changed, preventing Blue Shift maps from being correctly played. Additionally, the Steam port omits the fixes from the Blue Shift patch that prevent known map and model glitches. The Steam port also introduced several other bugs that did not exist in the original release, such as the GUI color now being displayed in the standard Half-Life orange, not Blue Shift blue. A third-party mod, Blue Shift Unlocked, addresses these issues and can successfully patch files from either a CD or Steam version of Blue Shift.

Weapons

 * Crowbar: A simple melee weapon that is iconic of the Half-Life series.
 * 9mm Pistol (Beretta M9 pistol with the High Definition pack and Glock 17 without): The first and simplest ranged weapon. Has good accuracy and does more damage per shot than the MP5, but these advantages are offset by a low rate of fire that makes it more useful on weak targets, like headcrabs or laser tripmines. Unlike most other ranged weapons, this pistol is effective underwater. Primary fire is accurate with every shot; secondary fire uses the rapid-fire function, and is faster but less accurate. The rate of fire is then comparable with the MP5, but does slightly more damage per shot. The 9mm Pistol is the standard equipment of the Black Mesa Security Guards, Calhoun would obtain it before the crisis unfolds.
 * Colt Python: An extremely powerful and accurate gun. It has a long reload time and a 6-round cylinder. Good for dispatching enemies in one hit, especially from a distance.
 * Submachine gun / Assault Rifle (High Definition Pack) (Heckler & Koch MP5N/M203 grenade launcher, Colt M4A1 Carbine/M203 grenade launcher with the High Definition pack): Excellent for close-range combat. Has a fast rate of fire that compensates for its poor damage and accuracy. Secondary fire launches an extremely powerful under-slung grenade that detonates on impact. It uses the same ammo pool as the pistol.
 * Shotgun : Does high damage at close range, but its broad fire cone makes it weak at a distance. It can be reloaded one shell at a time, but is slow to fully reload. Its secondary fire shoots two shells at once. Shotgun is the additional equipment of the Black Mesa Security, storing in security armoury, but Calhoun would not be able to get one before the crisis.
 * Rocket propelled grenade (RPG) launcher: Does a large amount of explosive splash damage. Secondary fire toggles a laser designator that guides the RPG to its target. Can only hold one rocket at a time with 5 more in reserve.
 * Hand grenade (Mk.II Fragmentation Grenade): A frag grenade that explodes a few seconds after being thrown. Can be bounced off of walls. Useful for killing enemies behind cover or softening up bigger targets.
 * Satchel Charge: A high-explosive that can be thrown a short distance and detonated when the player presses fire. Secondary fire allows the player to place several satchels and detonate them simultaneously.
 * Snarks (alien weapon): Small, aggressive alien creatures that quickly pursue their target, pestering and biting, until finally exploding after several seconds (or if shot). If they cannot locate a hostile target, they will turn on the player that set them loose. When used in number, they are very effective at drawing enemies out from their cover, or distracting them from attacking the player.

Console commands also make it possible to use Half-Life's original weapons, including the Long Jump Module.

Characters

 * Barney Calhoun
 * Rosenberg
 * Walter Bennet
 * Simmons
 * Harold
 * Gordon Freeman
 * Wallace Breen
 * The G-Man
 * Gina Cross
 * Adrian Shephard
 * Black Mesa Science Team
 * Black Mesa Security Force

HECU

 * Troopers
 * HECU Sentry Gun
 * M1A1 Abrams

Xen

 * Headcrab
 * Zombie
 * Houndeye
 * Bullsquid
 * Barnacle
 * Vortigaunt
 * Alien Grunt
 * Alien Controller

Blue Shift: Unlocked
Blue Shift wasn't initially available on Steam like Half-Life and Opposing Force. In August 2005 the Half-Life Improvement Team released a mod that ported the legacy version of Blue Shift to Steam, allowing the player to play it as a fully working mod for HL1 rather than its own stand-alone game. This had the added benefit of letting Blue Shift take advantage of features that had been added to the GoldSrc engine since then, such as detail textures. Almost immediately after, Valve made Blue Shift officially available – but it used its original engine, and suffered from many of the same bugs as the legacy version. A few months later, the porting project was updated, and renamed to Blue Shift: Unlocked.

Trivia

 * Otis, the overweight security guard introduced in Opposing Force, makes a few appearances in Blue Shift: first at the Black Mesa canteen wandering around, as a guard greeting Calhoun in the introduction chapter, at the shooting range enjoying a donut, and later as a dead body being disposed of by two soldiers.
 * Blue Shift has its own version of the Hazard Course training tutorial, suitably adjusted for security personnel. Instead of Gina Cross, a male security guard identified in the instruction manual as Miller serves as the holographic guide.
 * If the player types in "chase_active 1" or "thirdperson" in the console, the player model is still Gordon Freeman.


 * Examination of logo sprite files included with the game (Logo320.spr and Logo640.spr) reveals that Half-Life: Blue Shift was originally titled Half-Life: Guard Duty.