Alex's primary superpower is his ability to shapeshift, changing his body to suit his needs. Going hand in hand with this power is his ability to "consume" others, absorbing them entirely. This process allows Alex to quickly regain health by absorbing the biomass of his enemies. This also allows him to take on the forms of the enemies he absorbs, thereby allowing the player to move about the enemy as one of them. The disguise will only last as long as Alex remains inconspicuous. Alex has incredible physical strength, and will kill most humans in a single punch. He can perform various melee attacks without shapeshifting, as well as more gymnastic moves such as air combos, sliding along the ground using any humanoid enemy's body, and a high-speed rolling cannonball attack.
Alex can also transform parts of his body into a selection of martial implements acquired over the course of the game, either as purchased upgrades or being given them. Offensive powers include the large and powerful Blade arm, fast razor-sharp Claws (which can also erupt large spikes from the ground), the telescoping Whipfist, Musclemass that augments his strength, and the slow but powerful Hammerfists. Defensive options consist of a large shield on Alex's left arm for blocking ballistic attacks that needs to regenerate after excessive damage, and full body armor that exchanges agility and speed for toughness in hand to hand combat; both will allow Alex to plow through most obstacles when active. Vision modes include thermal vision, which allows Alex to see enemies through smoke and other obstacles at the expense of a decreased vision range, and Infected vision, which highlights those infected with the BLACKLIGHT virus as well as military units. Both vision modes muffle all of Alex's other senses, such as hearing, in order to concentrate on his sight. One defensive and offensive power may be active at a time, and using either will negate Alex's current disguise. In addition to his own abilities, Alex can take the weapons from defeated or absorbed enemies. These include automatic rifles, machine guns, grenade launchers, and missile launchers. He can also seize control of military vehicles, such as tanks and helicopters.
Alex's most powerful attacks are the Devastators, which require Alex to be in Critical Mass - either a state of near-death or the exact opposite, having excess stored biomass and increased health. These include the Tendril Barrage, which fires impaling tendrils from his body in all directions, the Groundspike Graveyard, which erupts massive spikes from the ground all around Alex, and the Critical Pain, which fires a single beam of hardened biomass from his hands to severely damage a single target.
For movement around the city, the player uses extreme parkour, enhanced heavily by Alex's increased physical abilities. When sprinting, he will automatically hop over cars, barriers and other obstacles without losing momentum. Alex will also scale any wall he comes into contact with and simply knock aside any humanoids that get in his way without stopping. He can jump great heights and distances, enough to clear five-story buildings, and can sprint at extreme speed indefinitely. Falls cause no damage to the player even from the greatest heights. Even small jumps are enough for Alex to dent the ground beneath him, and falls from sufficient heights will create shockwaves at the point of impact which will kill most humans nearby and send objects as large as cars flying. Falling height also factors into several of Alex's melee attacks.
Enemies in the game are the Infected: those infected with the BLACKLIGHT virus, and the Military. The Infected consist of ordinary civilians infected with the virus that are generally not a threat to Alex. However, the Hunters, huge creatures created from Infected water towers, are one of the main enemies in the game. Evolved Hunters referred to as Leaders are one of the most powerful creatures in the game and are incredibly hard for Alex to kill. The Military consist of ordinary soldiers which are usually not a threat to Alex, although they are capable of operating weaponry that is extremely dangerous to Alex, such as tanks and heavily armed helicopters. The Military also consists of BLACKWATCH, an agency dedicated to combating biological and nuclear warfare. BLACKWATCH is one of the intricate parts of the game's story and create some of the most deadly biological weaponry to combat Alex, including viral detectors capable of detecting Alex even in his disguise, and, introduced later in the game, the deadly poison Bloodtox, capable of slowly killing Alex and the Infected. Introduced later in the game are heavily armored and durable soldiers referred to as Super Soldiers, capable of fighting against Alex and some of the strongest Infected.
In order to gain more advanced upgrades, Alex is capable of sneaking into Military Bases using a disguise and stealthily consume various officials within the base. He can also set off an alert within the base, in which the only way to escape is to slaughter whoever is in the base. Alex can also gain upgrades from the Infected by collecting genetic data. Infected Hives, like Military Bases, are located all over the city, and produce genetic data constantly. Alex can destroy the Infected Hives or simply absorb the data on the outside as it is being produced. At the start of the game, only small factions of the Infected and Military are present in the city. However, as the game progresses, the Military and the Infected begin to expand. Territory in the city is made out of three distinct zones. Blue Zones are in Military control and are relatively clean of the Infection. Red Zones thrive with the Infection, although there still remains a strong Military presence. In some areas of the city, a Blue Zone and a Red Zone might converge, creating a new and distinct Purple Zone. In these Zones, the Military and the Infected are in a constant battle for control. How the player decides to act in these Zones determine which faction seizes the territory.
OS: Windows XP (with Service Pack 3) and DirectX 9.0c or (Windows Vista with Service Pack 2)
Video Card: 256 MB 3D hardware accelerator card required - 100% DirectX 9.0c with Shader Model 3 support *
Processor: Pentium Intel Core 2 Duo 2.6 GHz or AMD Athlon 64 X2 3800 + or better
RAM: 1 GB of RAM for Windows XP / 2 GB Windows Vista systems
Hard Drive Space: 8 GB
Sound Card: DirectX 9.0-compliant sound card
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