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 consist of the Infected and the Military. The Infected consist of ordinary civilians infected with the Blacklight 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