Half-Life, by the Washington-based developer team Valve, follows a day in the life of physicist Gordon Freeman, a bearded, bespectacled Heroic Mime who works in the Anomalous Materials laboratory at the vast Black Mesa Research Facility, a top-secret complex in the middle of the New Mexico desert. While performing a test on a strange crystalline substance, Gordon accidentally initiates a 'resonancecascade' — an event which causes bizarre, violent creatures to be spontaneously transported from another dimension. Now Gordon must work his way across the base in pursuit of a way to close the dimensional rift, fighting off not only the acid-spewing, electricity-shooting, zombifying aliens but also the Hazardous Environment Combat Unit (HECU), a special unit under the US military, who have swarmed into the complex and are destroying the creatures and silencing the facility's personnel with equal vigor.Notable for its total immersion of the player. The entire game is played out in first person and in real time, with very little sound not produced by actions in the game world, and no sounds at all made by the central character; also, there are no cutscenes (except at the very end, and even then you're still in control of the protagonist) — the player has control of the character at all times, and the story unfolds entirely in-game.The designers actually had great difficulty with the level design at first, and got stuck in a rut. In order to take stock, they created a single level containing every gimmick, enemy, and bit of level furniture that they had come up with for the game so far. Said level was fantastic, and they realized that this density of set pieces was the "certain something" the game lacked.Gearbox Software made three official Expansion Packs for the original game, which act as POV Sequels for the main plot. They are as follows:
Opposing Force takes place shortly after the Resonance Cascade, and has the player controlling Corporal Adrian Shepard, one of numerous US Marines sent as the initial clean-up team. Involved in a chopper crash and separated from his squadron, Shephard soon starts working with the science and security teams to make it out alive. Notably carries the most weapons of the expansions and core games, and that Shephard is the only protagonist whose fate still remains completely unknown.
Blue Shift runs concurrently with the main plot, with the player controlling security guard Barney Calhoun. Working to evacuate the facility following the accident, Barney's story is (presumed) to be somewhat cannon; he later reappears as a significant supporting character in the Half-Life 2 sequels.
Decay follows two other Black Mesa scientists, Drs. Gina Cross and Colette Green, and is the only official co-operative entry to date. Developed and released exclusively for the PS2 version of Half-Life, it can also be played on the PC thanks to the efforts of the mod community.
Air-Vent Passageway: While the series as a whole is famous for it, one of the most memorable subversions happens in the original. You are forced to crawl through some air vents, but the Marines hear you and shoot the hell out of it. The entire vent falls off the ceiling and crashes to the ground with you inside, or if you backed up, trapped in another part of the vent with the Marines shooting the hell out of you, albeit with more cover.
Artificial Brilliance: Half-Life was widely praised for the A.I. of its human Marine enemies, who were the first FPS enemies to work in squads and use complex tactical behaviors and movement patterns instead of simply charging in a straight line at the player...
Artificial Stupidity: ...of course, it still is not perfect. Grunts have a tendency towards friendly casualties when throwing grenades, and will forget about armed grenades they drop if they catch sight of the player. The player can also trick grunts into a killbox by lying in wait behind a corner. No matter how many of their fellow grunts are slaughtered, they will still charge blindly around corners.
Dead Character Walking: The original has this: if an NPC has scripted dialogue, but you kill them before they begin to speak, the corpse will speak anyway. The mouth moves and the audio can be heard, but otherwise he is dead. (This works at least on the security guard at the end of the Power Up sequence.)
Downer Ending: For Half-Life and Opposing Force, Gordon and Adrian are placed into stasis as some sort of mercenaries. It extends even farther - the Black Mesa incident attracted the Combine to Earth, completely enslaving it, and Adrian's dialogue with G-Man implies he'll be frozen for a very, very long time.
Donut Mess with a Security Guard: In Blue Shift, the fat security guard in the firing range is seen... well, holding a donut and moving around; if the animators intended for him to look like he's eating it, they failed. Later, a scientist tells another guard "Shouldn't you be off guarding some coffee and donuts?"
Dumb Jock: The graffiti the Marines leave on the walls to intimidate Gordon are full of misspellings.
Eye Beam: Pit Worm in Opposing Force shoots one from its sole eye. Players that Go for the Eye can cause it to flinch, but won't otherwise harm it.
Fragile Speedster: The female Black Ops Assassins have below average health, but are crazy fast, can make huge leaps, and on the highest difficulty setting, come equipped with a cloaking device. They're also Glass Cannons, and can easily wipe half your health away in groups.
One of the early Beta monsters for the game was called "Mr. Friendly", a creature that would attempt to "rape the player to death" according to the behind-the-scenes book, Raising the Bar.
The Gonarch toward the end of the first game was literally conceived because someone in the studio suggested "putting a huge testicle on a set of spider legs". It's name is also blatantly "King of Gonads".
Go for the Eye: In Opposing Force, the Pit Worm can be briefly stunned this way, and the key to destroying the Gene Worm involves shooting its eyes repeatedly.
Grappling-Hook Pistol: The detached barnacle in Opposing Force, but only to biological matter. It also doubles as a lethal weapon, heavily damaging organic enemies (or in the case of headcrabs, reeling them in and instakilling them).
Heal Thyself: The game follows the standard convention of instantly healing by picking up medkits. Unusually though, this actually appears to be canon rather than a game mechanic: the syringes the scientist use to heal you (as well as the wall health kits in the Playstation 2 port) have some weird green liquid in them that instantly heals all your wounds, and the medkits appear to contain the same substance. This may seem odd, but when you get to Xen, you encounter several pools of water that also magically heal you. The abundance of human corpses around Xen (as well as the location of an actual research outpost in Blue Shift) suggests that the technology for this was stolen from the aliens via these pools.
Indecisive Deconstruction: The first game can be read as a deconstruction of the Trope CodifierDoom. The basic premise (an experiment into teleportation technology goes horribly wrong) is basically the same as Doom. Like Doom, there is very little plot exposition. But unlike Doom, Half-Life showed you exactly how terrifying this kind of scenario would be if it happened in the real world; you must think and not act like a stereotypical Space Marine in order to remain alive. And of course, this kind of experiment would require immense levels of government funding. Necessitating a large covert laboratory. And thus, when everything goes wrong the military have to be called in to keep things covert. However, the developers have at no point implied any critical intent. Thus, Half-Life is arguably an unintentional deconstruction. Also, given how influential the first game was on all future shooters, the game seems like a played-straight example of the genre to someone raised on modern shooters.
It's also a reverse of the Doom. You're playing a guy who just started his job and doing his job - his first real work he's done just happens to mark the end of the world as he knows it. And right when he think he's out of the chaos the rescuing army are there to kill him. The security guards, which in doom are possessed and attempt to kill you, are friendly and are just trying to survive.
Manual Leader, AI Party: In Opposing Force, you're usually teamed up with a squad of AI soldiers which you can direct, and use to perform certain functions (but you can't directly play as one of them).
Militaries Are Useless: While the soldiers are pretty tough, the guy who gave them orders is probably very, very dumb. The lab accident engineered an inter-dimensional alien invasion? Let's kill the security guards to prevent them from doing their job! A particular scientist seems pretty good at killing loads of aliens for us? Let's devote all our resources to taking him down! Now because of all this mess we have plenty of witnesses to kill? Let's shoot them on sight instead of gathering them (and then shooting them)! And now our soldiers are being overwhelmed by the aliens that just keep coming? Let's send other soldiers to kill these soldiers! In the end, it falls to resident Badass BookwormAction Survivor to go to the alien dimension and kill their leader, as the soldiers had long since pulled out due to being overrun.
There's also the fact that the soldiers shut down the launch of a rocket that would plug the resonance cascade and stop the invasion, forcing Freeman to kill about a dozen of them to launch it himself. Inspection of the building suggests that this is because they just immediately shot the scientists and shut off the rocket without bothering to learn or ask about what it was for.
Though it was somewhat of an aversion in that the soldiers were fairly effective against the aliens, holding their own against even the Xenian military units rather well. They just realized too late that they were a single battalion trying to fight the entire alien army. And, to their credit, the nuke they dropped on Black Mesa did plug up the invasion.
No Indoor Voice: The HECU Marines, due to their voices always sounding like they're coming out of walkie talkies. Even lampshaded by one line they say while idle: "Squad, quiet down!" at the same not-very-quiet level.
No OSHA Compliance: Apparently Black Mesa was built by people to ensure no employee survives in even the smallest emergency.
Not So Stoic: The HEV suit computer is usually, well, mechanical, with no inflection on its words. But when Gordon is on the verge of death:
Punch Packing Pistol: For some reason, the same 9mm cartridges do more damage when fired from the Glock than when fired from the MP5. Also the Glock is given the miraculous ability to be fired underwater. The Python does far more damage than the .357 it's supposed to be as well, doing three times more damage than Opposing Force's M249, which fires rifle rounds that fairly realistically took down soldiers in full body armor after 3-5 hits.
In reality a 9mm Glock can actually fire underwater, although the bullet would only travel a few metres and would do little damage.
Portal Network: Xen has one. Gordon uses it to navigate the place, as he often finds himself trapped inside small floating islands that can barley sustain a few animals (such as the first real island), or even "islands" that are just rocks that have just enough to stand on. Why they have one is a mystery however, as the aliens are repeatedly shown to be able to teleport wherever they want, even in groups, as a consequence of the Nihilanth's control.
Secondary Fire: Several weapons featured this. Mostly they were simple things like a laser sight or a scope, but in some cases it basically made the weapon two guns in one, and in other FPS games of the time it would've been a separate weapon altogether rather than a secondary fire. It can be said that Half-Life 1 actually had 19 weapons instead of 15.
The SMG/assault rifle had an M203 grenade launcher mounted under that could hold ten grenades and never needed to be reloaded. This, combined with its reasonably common ammo, made it somewhat overpowered.
The Tau Cannon's secondary fire was a powerful, charged, pixel-accurate laser beam that changed it from a rapid-fire infantry muncher to a single shot anti-vehicle weapon.
The Hivehand had two modes of fire: the primary fire launched heat-seeking "thornets" at a semi-automatic rate. The secondary function "dumb fired" all the thornets in quick succession; much faster than the primary fire, but without the homing ability.
Scenic Tour Level: The former Trope Namer. Gordon takes a tram in the original, Shepard takes a chopper ride with his squadron in Opposing Force, and Barney makes his way to an elevator while passing through security.
Shark Tunnel: "Crush Depth" in Opposing Force, where a few of the lovely icythyosaurs have broken out of.
The Dev Team Thinksof Everything: In Blue Shift during the ''Captive Freight" level, you come across two scientists in your search for Dr. Rosenberg. If you actually try to backtrack with these two scientists following, you would come to realize that there is an invisible wall that will not allow the scientists to walk any further. That's because if you were able to backtrack far enough, you would come across the breakable wall that you would eventually learn about from Dr. Rosenberg that leads to where his colleagues are creating the portal device to escape Black Mesa. The reason for the invisible wall was so that you couldn't break the story and have two random scientists waiting at the elevator when Dr. Rosenberg leads you to it later on in the story.
The ammo belt feeding the M249 in Opposing Force is fully animated, being properly removed when reloading while there's still ammo and the belt actually running dry. This is as opposed to other games when the belt is infinitely long and mysteriously disappears when reloading. Most games, even modern ones, don't even do this.
One part of Opposing Force has Shephard finally catching up to Freeman and seeing him just as he jumps into the Xen portal (which the player does in the main game). Should the player manage to kill Freeman in the very small time window he is visible, the game grants a Non-Standard Game Over for breaking story canon:
SUBJECT: SHEPHARD STATUS: EVALUATAION TERMINATED POST MORTEM:Subject attempted to create a temporal paradox.
Tracking Device: Apparently Freeman's HEV suit has one, and both the science team and the military have been using it to monitor his location and, in the latter's case, set up ambushes.
Two-Keyed Lock: The test chamber has to be unlocked by two scientists each activating retinal scanners.
Vader Breath: The "Gonomes", the final evolution of the Headcrab Zombies, could easily be identified by a rattling noise.
Vaporware: A Mac version was planned, developed, and close to releasing in 1999… when Valve pulled the plug.
A version for Mac OS X was released in 2013, but it most likely uses none of the code from the original Mac port.
Vengeful Vending Machine: Early in Opposing Force, Shepard encounters a fat security guard named Otis with his hand stuck in a vending machine. The guard curses, going like "Stupid machines!" and asks the player for a quarter. It's possible to operate the machine with the Use key, and this makes a candy bar pop out. However, the guard does nothing if you do.
Visual Pun: In Opposing Force, to defeat the Pit Worm, you have to first reactivate a Gear Box, and open a pressure Valve. Hmm...
For a bonus, before activating the valve you have to use a Steam Vent. Since Opposing Force came out years before Steam, it's coincidental, but still pretty funny.
Weaponized Offspring: The Gonarch creates Headcrabs (who are essentially smaller versions of it) during the fight against it.
What Happened to the Mouse?: Race X and poor Adrian Shephard. Marc Laidlaw has said that he doesn't want to develop further on Race X, saying that they were only experiments by Gearbox for future games, and that Gearbox would have developed them further if they were still doing expansions for Half-Life. He has also jokingly called Adrian a case of Schrödinger's cat, as he is in a state of being both canon and non-canon at the same time. His ultimate fate depends on what Valve want to do with him in the future. Gabe Newell has reportedly been wanting to incorporate him in the canon for some time.