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Developed by Cyberlore Studios and published by Microsoft, Mechwarrior 4: Mercenaries is a standalone expansion to Mechwarrior 4: Vengeance. The game mirrors Mechwarrior 2: Mercenaries with the ability to manage a mercenary company.


In MechWarrior 4: Mercenaries, you lead lances of 'Mechs into combat for private and House contracts for C-bills. Players assume the role of "Spectre" a fledgling mercenary 'Mech pilot, as he attempts to start up his own mercenary company and achieve riches and fame. The player must choose one of four established mercenary units as a sponsor.

  • Wolf Dragoons: One of the most famous mercenary companies, companies sponsored by the Dragoons start with Clan technology and have greater purchasing power of Clan tech. However they start with the least amount of money and Clan tech is very expensive.
  • Kell Hounds: Another famous mercenary company and a potential employer and ally in future missions, companies sponsored by the Kell Hounds have early access to Clan tech but do not start with it like the Dragoons do.
  • Northwind Highlanders: A mercenary group with a Scottish ancestry, companies sponsored by the Highlanders start with more money and earn 20% more C-bills each mission.
  • Gray Death Legion: A mercenary unit in the process of rebuilding, companies sponsored by the Legion gain early access to Lostech weapons and have greater purchasing power of these weapons

The gameplay is based on using the money you earn by completing contracts to purchase new 'Mechs and weapons for you and your lancemates. Your weekly costs to repair 'Mechs and drop into missions will increase based on the weight and number of your 'Mechs, but more advanced missions require heavier equipment, so striking a balance is very important in the campaign. The Free Market is introduced, allowing players to buy or sell unwanted 'Mechs and weapons. Players can now command a secondary lance, allowing up to eight 'Mechs to participate in a mission. Furthermore there is Solaris VII, a 'Mech fighting sport planet that the player can participate in to earn more C-Bills and gain points towards Steiner or Davion factions.

There is a point system in this game's story similar to moral choice systems in other games. When you take a mission you will earn points toward either Steiner or Davion loyalty in the FedCom civil war. After a certain point it will be impossible to keep taking missions from both sides of the war and your unit will be forced to choose an allegiance to one side or the other.

The ending of the game's campaign varies depending on which side of the civil war you have decided to support, as your help will ultimately sway the outcome of this conflict. Players who chose to side with Steiner have access to two endings, making a total three possible endings. Regardless of which ending the player takes, the story ends with an ominous warning about the Word of Blake invasion. To date, there has been no continuation of this story in the form of another MechWarrior game, though various novels in the BattleTech universe have explored story elements of the years after the events in the game.

Free Release

On the 25th Anniversary of BattleTech, Mechwarrior 4: Mercenaries became free to play via the MekTek website. MekTek also provides the servers for multiplayer and also released the MekTek MechPak 3.1, a large mod adding an additional Mechs, Power Armors, weapons and more. MechPak 3.1 is required to play on MekTek servers.

New 'Mechs

Mercenaries contains all the 'Mechs from Vengeance and Black Knight as well as 10 new 'Mechs for a combined total of 36 'Mechs. Mercenaries also contains data from the Clan and Inner Sphere 'Mech Paks although the 'Mechs are unplayable if the Mech Paks are not installed. Furthermore, the 'Mechs from the Clan and Inner Sphere 'Mech Paks cannot be salvaged or bought in the campaign and can only be played in Instant Action and Multiplayer. Including the 'Mechs from the 'Mech Paks, Mercenaries contains a total of 44 playable 'Mechs.


FireflyManufacturer: Coventry/Earthwerks Combine
Introduced: 2790
Model: FFL-4B
Class: Light
Cost: 2,342,600 C-bills
Mass: 30 tons
Chassis: Earthwerks Firefly
Armor: StarSlab/1
Engine: GM 150
Communications System: Datacom 18
Speed: 86.4 km/h
Jump Jets: Lexington Lifters
Armament: 3xMedium Lasers, 1xLRM-5, 1xAnti-Missile System
Manufacturer: Luthien Armor Works, Irian BattleMechs Unlimited
Model: OW-1
Class: Light
Cost: 7,882,875 C-bills
Mass: 35 tons
Chassis: Alshain Class 48 Omni
Armor: Starshield
Engine: VOX 280 XL
Speed: 129.6 km/h
Jump Jets: None
Armament: 1 x TAG, 1 x C3 Slave Unit, 1 x Active Probe, 1 x Medium Laser, 2 x Small Lasers, 2 x LRM-5s
Manufacturer: Sheridan LM-TA 8-10, W-7 Facilities, Wolf Clan Site 3
Introduced: 3010
Model: Prime
Class: Light
Cost: 7,021,688 C-bills[2]
Mass: 35 tons
Chassis: Hooded Endo-Lite Endo Steel
Armor: Star Lite Ferro-Fibrous
Engine: Great Father 210 XL
Speed: 97.2 km/h
Jump Jets: None
Armament: 1xFlamer, 2xER PPCs


Manufacturer: Irece Alpha, others
Introduced: 2826
Model: Hellhound
Class: Medium
Cost: 5,320,500 C-bills
Mass: 50 tons
Chassis: Puma Type Medium Endo Steel
Armor: Alpha Plate Special Ferro-Fibrous
Engine: 300 Standard
Speed: 96 km/h
Jump Jets: BMP Mk. XXI
Armament: 1x Large Pulse Laser, 2x ER Medium Lasers, 2x Streak SRM-2s


Manufacturer: HildCo Interplanetary, Independence Weaponry, Tao 'Mechworks, General Motors
Introduced: 2510
Model: VTR-9B
Class: Assault
Cost: 8,044,320 C-bills
Mass: 80 tons
Chassis: HildCo Type V
Armor: Durallex Heavy
Engine: Pitban 320
Speed: 64.8 km/h
Jump Jets: HildCo Model 12
Armament: 1xAutocannon/20, 2xMedium Lasers, 1xSRM-4
Manufacturer: StarCorps Industries
Model: LGB-7Q
Class: Assault
Cost: 7,408,325 C-bills
Mass: 85 tons
Chassis: StarCorp 100
Armor: StarSlab/9.5 Mk II
Engine: Strand 255
Speed: 54.0 km/h
Jump Jets: None
Armament: 2xLRM-20s, 2xLRM-5s, 2xMedium Lasers
Manufacturer: Kallon Industries
Model: TLR1-O
Class: Assault
Cost: 25,338,448 C-bills
Mass: 85 tons
Chassis: Kallon Type XIX Endo Steel
Armor: Starshield A with CASE
Engine: KalTek 340 XL
Speed: 64.8 km/h
Jump Jets: None
Armament: 1xGauss Rifle, 1xLarge Pulse Laser, 1xMedium Pulse Laser, 1xStreak SRM-4, 2xER Medium Lasers
Manufacturer: Coventry Metal Works
Introduced: 3060
Model: HA1-O
Class: Assault
Cost: 12,938,860 C-bills
Mass: 95 tons
Chassis: Standard
Armor: Standard
Engine: 285 Fusion
Speed: 54.0 km/h
Jump Jets: None
Armament: 2 x ER Large Lasers, 2 x Medium Pulse Lasers, 1 x ER Small Laser, 1 x LB-X Autocannon/20, 2 x Streak SRM-2s
Manufacturer: Alshain BattleWorx
Introduced: 3001
Model: Prime
Class: Assault
Cost: 35,713,073 C-bills
Mass: 95 tons
Chassis: Clan Series Assault SXE
Armor: Arcadia Compound Delta VII Ferro-Fibrous
Engine: Heavy Force 380 XL
Communications System: Dash-2 Optima
Speed: 64.8 km/h (86.4 km/h with MASC)
Jump Jets: Pryzhok WM10
Armament: 1xGauss Rifle, 2xER Large Lasers, 2xMachine Guns
Manufacturer: Defiance Industries of Hesperus II
Introduced: 3063
Model: FNR-5
Class: Assault
Cost: 11,470,000 C-bills
Mass: 100 tons
Chassis: Foundation Type 220 Endo Steel
Armor: Durallex Speical Heavy V2 with CASE
Engine: Vlar 300
Communications System: Angst Discom /w Guardian ECM
Speed: 54 km/h
Jump Jets: None
Armament: 1xMedium Pulse Laser, 2xER Medium Lasers, 2xHeavy Gauss Rifles

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