EDITOR'S NOTE: This review contains minor spoilers for the original Half-Life 2. If you are yet to play this utterly compelling king of shooters then read no further - instead, click on the link below for our Half-Life 2 review, then buy the game as soon as you can. You won't regret it!

Half-Life 2 is the greatest FPS I've ever played, bar none, taking a top seat in the legendary halls of gaming history as an all-time classic. Its successful teaming of captivating narrative, top-notch production values, incredible physics and thrilling gameplay (among countless other winning qualities) is unsurpassed by any shooter before or since its release, with its only minor sour point being an agonizing cliffhanger ending that didn't exactly deliver a satisfying conclusion to an otherwise masterpiece videogame experience. Rather than diving straight into a full-blown Half-Life 3 sequel to wrap up its loose ends, Valve decided to continue the Half-Life 2 saga with an episodic content trilogy. Well, after nearly two years, Episode One has made its debut, carrying on the brilliance of its predecessor and, believe it or not, somehow managing to top it at the same time.

Episode One begins immediately where Half-Life 2 left us all dangling in suspense, as Gordon and Alyx are caught in a massive explosion atop the Combine Citadel. So, how do they survive? That is the big question. Well, you'll have to play for yourself to find out, but they do indeed survive only to find City 17 in shambles and the Citadel set to self-destruct. The only narrow chance they have at escaping is to venture back into the depths of the crumbling Citadel in an attempt to stunt the core's meltdown so there's enough time to make it out of the city alive and help save as many other citizens as possible. From this point on you are taken on a thrilling five-chapter roller-coaster ride in a race for survival, all with the same cinematic scope, superb script and memorable characters that made Half-Life 2 such a classic.

Valve has stated that each of its three planned episodes will contain its own theme, and with Episode One the theme of the game focuses on building the relationship between Gordon and Alyx, which becomes instantly apparent as Alyx follows alongside Gordon (played by you) throughout the entire episode - except for a few short loner sequences. This new team dynamic is pulled off marvellously, with Alyx supporting your every move thanks to impressive AI (you never have any control over her) and some of the best character interaction ever presented in a videogame. Alyx holds her own in a firefight and is always at your side to lend a hand when the action gets intense. In one instance she provides covering sniper fire as you clear a path down an enemy-filled section of City 17, while in another she mans a mounted turret and watches your back as you lead a group of survivors to safety.

What's even better, though, is the subtle dialogue interaction that she and Gordon engage in through every step of their journey together. Alyx is constantly warning you of surrounding dangers, which adds more realism and emotion to the action, while also regularly joking around to lighten the mood during such tense times (which works beautifully thanks to witty script writing). One of my favorite examples of this is when you are exploring a dark area with your flashlight off and she groans and moans like a zombie, only to laugh when you turn around in fear and realize it was her pulling your leg. Moments like these pop up throughout, creating a certain depth and richness to Gordon and Alyx's relationship that generates an emotional bond between you the player and the characters in the game.

Beyond the newly introduced team dynamic, Episode One features essentially the exact same gameplay content as the original Half-Life 2 - and that's fine by me, because the gameplay was already as good as it gets for a FPS. No new weapons have been introduced, although the gravity gun definitely gets more play this time around and there are no vehicle sequences whatsoever. There really aren't any new enemies to combat at all either, save for a tough new Combine/zombie hybrid (jokingly nicknamed the "zombines" by Alyx) that like to run suicide missions with grenades in their hands when all else fails. But other than that, you're up against the usual headcrabs, zombies, Combine soldiers, Antlions and Striders - though these familiar enemies have apparently received a slight AI boost from before and provides a stiffer challenge. The overall gameplay makeup may not have changed, but somehow Episode One just seems to be even more fulfilling and satisfying, from the smarter physics-based environmental puzzles down to the more compact and frenetically paced nature of the action.

Similarly to the gameplay, not much has changed as far as the graphics and audio are concerned, although don't think there haven't been some improvements in these areas as well. In the time since Half-Life 2 stormed the gaming world, Valve has tweaked and enhanced the powerful Source Engine and the result is a game that can still hold its own against any of the top PC games. High Dynamic Range lighting is the most apparent graphical upgrade, as it clearly adds an additional layer of beauty and realism to the familiar environments, should your PC be powerful enough to support it that is. Crisper textures are also on hand, as is improved facial animation technology that renders the cast of characters with heightened realism. So don't worry about any dated visuals here folks- this game still looks gorgeous! It still sounds unbelievable too, featuring tense music, rich atmosphere and ambiance, and, most importantly of all, the returning Hollywood-caliber voiceover cast, which again puts on an unparalleled voice acting clinic that puts every other game to shame.

Now to touch on what has become the only major topic of criticism tossed at Episode One - its short length. From its opening moments to its obvious cliffhanger ending (you didn't think the story was going to tie itself up with two more episodes left did you?), Episode One lasts between four to six hours based on the selected difficulty level and your skill as a gamer. Sure, that is brief, however you must remember that this is episodic content sold at a budget price of only 20 bucks, less than half of the cost of the market's standard retail game prices. Also keep in mind that this game is so damned brilliant that you'll want to load it up and play through it again at least a second time (if not more) from time to time, not to mention the fact that there is a cool developer commentary feature packed in, along with the inclusion of the Half-Life Deathmatch: Source and Half-Life 2 Deathmatch multiplayer components for those who don't already own them… so yeah, there is plenty of value to be had here.

Needless to say, Half-Life 2: Episode One is every bit as much of a classic as Half-Life 2, completely recapturing everything that made the original so beloved and somehow ramping it all up to another level of greatness. Some may quibble with the campaign's brevity, while others may do the same with the lack of any revolutionary new content, but while they're complaining I'll be enjoying one of the most exhilarating videogames ever created and impatiently awaiting Episodes Two and Three!

Reviewed by Matt Litten for AceGamez (All Rights Reserved).