have you heard of half life - decay?

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we all know about half-life expansion packs opposing force and blue shift.. but do you people know that there is another expansion pack as well? its called half-life decay. the storyline is based on two female scientists. Dr. Cross and Dr. Green are members of a different team in Black Mesa than Half-Life's protagonist, Gordon Freeman. They are responsible for monitoring the equipment which Gordon uses during the experiment, and are in turn monitored by Dr. Rosenberg (who also appears in Blue Shift) and Dr. Richard Keller. Cross and Green deliver the test sample to Freeman just before the "incident" occurs; like Freeman, they are forced to fight for survival in the aftermath of the resonance cascade. Cross and Green help Rosenberg reach the location he is later found in by Barney Calhoun in Blue Shift. They then proceed to prepare a satellite for launch (an event seen in Half-Life) and subsequently use the satellite in tandem with ground-based equipment to significantly weaken the effects of the resonance cascade. During the conclusion of the game, both characters are caught in what is explained as a "harmonic reflux" by Dr. Keller. It is during this sequence that the voice of Dr. Rosenberg can be heard warning that he "can't keep the portal open much longer," alluding to Calhoun's coinciding trip in Xen during Blue Shift. Dr. Cross and Dr. Green then return safely and Dr. Keller congratulates them on their success. It still remains unclear whether the doctors managed to survive the nuclear explosion that occurs at the end of Opposing Force. Chapters The game storyline is divided into a total of 10 "chapters":Dual Access — The experiment must be successful. Monitor the anti-mass spectrometer and deliver anomalous materials to Dr. Freeman. Hazardous Course — Survivors must call for help. Escort Dr. Rosenberg through the training area (The Training Facility, Sector A) to the surface. Surface Call — To call for help, survivors need active communications. Help Dr. Rosenberg establish an uplink with the outside world. Resonance — The rift between Earth and the alien world is widening. Reset the dampening fields to prevent another cascade. Domestic Violence — A satellite controls major recovery systems. Locate a security guard who knows the satellite signal codes. Code Green — A satellite must be in orbit for recovery systems to operate. Upload the satellite signal codes before the delivery rocket launches. Crossfire — Prototype equipment must be used to seal the dimensional rift. Manually raise the displacement beacon into place. Intensity — The prototype equipment requires huge amounts of energy. Activate the beam matrix to power the displacement beacon. Rift — A resonance reversal may seal the dimensional rift and save the planet. Use the displacement beacon to initiate a reversal. Xen Attacks — Two Vortigaunts named drone X-8973 and R-4913 must retrieve the crystal sample which was used in tests in Black Mesa and take it back to their leader Nihilanth. Unlike the other narrative-based Half-Life games, which are single player only, Decay is designed for co-operative play. While it can be played by one person, swapping between the roles of Dr. Cross and Dr. Green, the game is intended to be played by two players in split-screen. Various puzzles and combat situations throughout the game require the co-operation of the two characters. The game is also unique in the context of the Half-Life series by being the only game divided into separate missions, instead of a single unbroken narrative. Decay has a ranking system for all of its nine missions, ranging from F (worst) to A (best), based on accuracy, number of enemies killed, and damage taken. If all nine missions are achieved with an A level, a bonus mission, Xen Attacks, can be played as a pair of Vortigaunts. Decay is also the only game of the series where it is possible to fight and defeat a Xen Manta ship, which serves as the final boss.