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In Armored Core 4, the Arena is called "Simulator". The player faces off against 39 enemy NEXTs affiliated with different companies, with the exception of Amazigh and Sus. The Arena is split up into Data Packs which are determined by NEXT affiliations. After selecting an opponent, the player is granted the ability to determine the battlefield.

When a NEXT is defeated in a Data Pack, the player is given a monetary reward, and an additional monetary award is granted for defeating all the NEXTs in a given Data Pack. Other rewards are also available, and include items such as exclusive AC parts, emblems, FRS Memory for tuning, and even new Data Packs.

In Simulation Mode, the player does not need to buy the parts in the schematic to use it; a schematic made entirely out of unpurchased, "DATA ONLY" parts can be used in Simulation without penalty. There is no penalty for losing in Simulation mode, and no cost for repairs or ammunition if the player wins.

Note: Lynx and NEXTs are stylized as "LINX" and "Nexts" in the English versions of Armored Core 4. The sequel, Armored Core: For Answer would later have these stylized as "Lynx" and "NEXTs."

Rank Data Pack Data Pack Client LINX NEXT Affiliation In-game description
1 NDP-S001 GA America Berlioz Supplice Rayleonard Rayleonard's legendary hero of the National Dismantlement War. A pragmatist and consummate soldier, his skill has earned him the exceptional privilege of using parts from other companies.
2 NDP-S001 GA America Sadhana Atman Eqbal The Wizard of Eqbal who pilots a reverse-joint leg AC. Both mathematician and zealot, his fighting style defies all understanding at times, making it difficult to counter.
3 NDP-C001 RAY GA America Anjou Orleans Rayleonard An Original, and the queen of close-range combat. Countless top-rank Ravens fell before her custom great laser blade during the National Dismantlement War.
4 NDP-E001 ROS-OME GA America Leonhardt Noblesse Oblige Rosenthal Rosenthal's only Original. His consistent record of success on the battlefield stands as a justification of the Company's extreme quality-over-quantity philosophy.
5 SDBFF RANK-A Rosenthal Mary Shelley Prometheus Bernard and Felix Foundation The undisputed empress of BFF's military force whose long-range sniping tactics formed the basis of the Company's official style.
6 NDP-S001 GA America Celo Testament Omer Science Technology Omer's golden boy, a youth possessed of AMS compatibility far above the norm. While his indisputable genius makes him an ideal test subject, immaturity hampers him on the battlefield.
7 NDP-C002 AKV GA America Tepes V Silver Bullet Akvavit A surviving first-gen LINX, he is armed with Next-piloting experience from the earliest stages of their development. Rumor suggests his end is near from severe Kojima poisoning.
8 SDBFF-RANK-A Rosenthal Wong Shao Lung Strix Quadruped Bernard and Felix Foundation One of the very few elderly LINX still active, this wise and unwavering professor of war is also Mary Shelley's caretaker and guardian at BFF.
9 NDP-B001 LEO GA America Sir Maurescu Lambda Leonemeccanica The quintessential Original, defined by extreme self-consciousness. His skills are proven but his strong desire for power makes a handful for his handlers at Leone.
10 SDGA RANK-A Rosenthal Menno Ruh Primitive Light GA America GA's strongest Original and ace in the hole. The heavyweight bipedal juggernaut she pilots mirrors her unwavering will and fundamentalist fervor.
11 NDP-C001 RAY GA America Aabye Memento Mori Rayleonard Though Rayleonard's primary force, this infamously powerful Original sees limited action because his reckless use of firepower often affects allies as well as foes.
12 NDP-C001 RAY GA America Zanni Roughcut Rayleonard This reverse-joint leg pilot from Rayleonard utilizes a variety of powerful boosters in a unique 3-dimensional combat style. Widely known for using experimental new parts.
13 NDP-E001 ROS-OME GA America Palmette Anzu Omer Science Technology Omer's other Original. While lacking Celo's genius, her stability and high AMS compatibility allowed her to perfect Omer's brand of unique aerial warfare.
14 NDP-B002 ALD-MEL GA America Sherring Critique Aldra An Original with Aldra, wielding high-output EN weaponry. A Raven during the National Dismantlement War, this veteran is unfazed by the bells and whistles of new technology.
15 SDBFF RANK-A Rosenthal Unseel Red Cap Bernard and Felix Foundation The infamous rogue Original from BFF who favors ECM and a sniper rifle. Despite his constant boasting, he'll stoop as low as he has to in order to win.
16 NDP-B001 LEO GA America Kasumi Sumika Ciliegio Leonemeccanica A sparse record leaves much of this female Original a mystery. Her craft, made of Leone's latest parts, is considered the strongest in the company's arsenal.
17 NDP-A001 EQB-TEC GA America K.K. Liver Drive Eqbal This Eqbal Original's mastery of the physical blade dates back to his Raven days. Though difficult to use, the weapon's overpowering force slides through even Primal Armor with ease.
18 NDP-B002 ALD-MEL GA America Stiletto Les Années Folles Melies Melies' sole LINX, she pilots a tank type NEXT with Energy firepower that rivals even mobile fortresses with its destructive capabilities.
19 SDBFF Rank-B Rosenthal Francisca Helix I Bernard and Felix Foundation BFF Original and heiress of the Wolcott Legacy. Often deployed as a vanguard unit paired with her younger brother Eugene, her solo capabilities are limited.
20 SDBFF Rank-B Rosenthal Eugene Helix II Bernard and Felix Foundation A capable LINX known for his balanced AMS compatibility. Most often deployed as a backup for his sister Francisca. His level head and decisiveness belie his young age.
21 NDP-C002 AKV GA America P. Dam Hilarios Akvavit This Akvavit femme Original operates a first-gen Kojima tech AC. Though known for her combat skills, emotional instability occasionally derails her ability to complete the mission.
22 SDGA RANK-A Rosenthal Mrs. Theresia Karyon GA Europe GA's dedicated Original, a quirky embodiment of GAE's unique Next battle ethic. Her experimental quadruped differs from most GA designs.
24 SDGA RANK-A Rosenthal Warcar Kurumagakari Arisawa Heavy Industries Former tank pilot now working as an Original for Arisawa. His craft's physical armor outclasses other NEXTs, and is paired with enough firepower to flatten an army.
25 NDP-A001 EQB-TEC GA America Borisovich Bogomol Technocrat Though Technocrat's middle-aged LINX's combat style is as rough and imprecise as his Company's parts, Bogomol's raw power forces foes to tread carefully.
26 NDP-A001 EQB-TEC GA America Nadezhda Droit Fevered Flow Eqbal This Eqbal Original fought in the last days of the National Dismantlement War, popularizing the development of weapon-type arm parts to compensate for his low AMS compatibility.
27 NDP-E001 ROS-OME GA America Michael F Kanonenvogel Rosenthal Former Raven and seasoned pilot from Rosenthal's Next tech test division, Saphirus Force, who now commands an azurite NEXT on the battlefield.
28 NDP-A001 EQB-TEC GA America Shiv Anil Ambani Carrion Crow Eqbal Elite LINX selected from Eqbal's Bharat Squadron. A born soldier with considerable battlefield experience and the skill to see his mission through.
30 NDP-E001 ROS-OME GA America Mido Auriel Null Omer Science Technology Omer's talented princess, selected after the National Dismantlement War for her adaptability and experience. She holds Omer's top rank for close combat.
31 NDP-B001 LEO GA America Sara Angelic The Blue NEXT Leonemeccanica Still just a young girl, this LINX is a test case for Leone's unique military modus. Her record suggests the test was a success.
32 SDGA-RANK-B Rosenthal Enrique Elkano Triana GA America The first LINX found by GA's special committee, armed with an adaptable middleweight biped stocked with enough missiles to cover the battlefield.
33 NDP-C001 RAY GA America Shinkai Split Moon Rayleonard Promoted from prototype test pilot to full LINX with high hopes, his performance has earned him a place in Rayleonard's core cadre.
34 SDBFF RANK-B Rosenthal Iakchos Anima Bernard and Felix Foundation Formerly a NEXT tech engineer, this unique LINX now pilots a quadruped like his superior Wong Shao-Lung. Though a solid theoretician, his skills in battle is as of yet unknown.
35 SDGA-RANK-B Rosenthal Unite Mons Tyrant GA America A member of GA America who is described as being 'half-baked' and a symbol of GA's insecurities. Even in a Next using a weapon-type arm, he lacks the AMS aptitude to be a much of a force in battle.
36 SDGA-RANK-B Rosenthal Roadie Feedback GA America Another rough-cut LINX in the vein of Unite Mons. A match for only a small squadron of Normals, his style involves complete dependence on his AC's firepower and armor.
37 NDP-B001 LEO GA America Ay-Pool Vero Nork Leonemeccanica A brand new addition to Leone's roster of LINX, her missile heavy craft is rumored to be have been created for Next to Next combat.
38 NDP-B002 ALD-MEL GA America Jan Blind Bold Aldra The most recently-added LINX among the Companies. Little is known beyond his history in the national army, and his crushing successes on the field thus far.
39 None None Anatolia's Mercenary (player character) Player choice Anatolia N/A
40 NDP-S001 GA America Joshua O'Brien White Glint Aspina An early AMS test subject, this ideal mercenary from Aspina pilots a custom AC tuned for extreme speed. His tactics are sure and refined.
Unranked NDP-X002 MAGHRIB GA America Amazigh Barbaroi Maghrib Liberation Front One of Maghrib's irregular LINX, and pilot of an Eqbal-base lightweight custom AC. The iconic hero of the White Africa anti-establishment movement. He fights to free his land from the grip of of the corporations.
Unranked NDP-X002 MAGHRIB GA America Sus Asyut Minya Maghrib Liberation Front The Maghrib Liberation Front's other irregular LINX, pilot of an Arisawa-based tank AC. Dull in judgment, his skill on the battlefield is a pale shadow of Amazigh's.

Trivia[]

  • NEXTs 23 and 29 are labeled "MISSING" in-game.

Speculation[]

The following information is "gray area" content — it may not be completely factual, and/or falls under YMMV territory.

  • One fan theory points to Amazigh and Sus once having been ranks 23 and 29 respectively, as they are the only irregulars encountered throughout the game's story mode.
Armored Core 4
Arena ("Simulator") Enter subpage
Characters AabyeAmazighAnatolia's MercenaryAnjouAy-PoolBerliozBorisovichCeloFiona JarnefeldtFranciscaEmill GustavEnrique ElkanoEugeneIakchosLeonhardtJanJoshua O'BrienKasumi SumikaK.K.Mary ShelleyMenno RuhMichael FMido AurielMrs. TheresiaNadezhda DroitPalmetteP. DamSadhanaSara AngelicSherringShinkaiShiv Anil AmbaniStilettoSusTepes VUnite MonsUnseelWarcarWong Shao-LungZanni
Enemies Enter subpage
Gameplay mechanics Over Boost
New: Primal ArmorQuick Boost
Locations Abandoned CityColony AnatoliaAntarctic OceanAnti-Satellite Cannon, The EhrenbergAspinaCyclical Power Plant, MegalisDesert Phishin LoraDornier Mining StationEocene BaseEritrean StrongholdExavilFormer Chinese ShanghaiGanea DesertGear TunnelGryphon, The Independent CityHazen FacilityHejde ArsenalLevanteer FacilityNasser Oil RefineryNorth Atlantic SeaOld Gelts'a FortressRazghul Colony's Subterranean FacilityRobert Mayer BridgeThe SphereZextex Global Airport
Missions Enter subpage
Organizations AkvavitAldraArisawa Heavy IndustriesAspinaBernard and Felix FoundationCougerEqbalGlobal ArmamentsGlobal Armaments EuropeLeonemeccanicaMeliesMSAC InternationalOmer Science TechnologyRayleonardRosenthalTechnocrat
Parts Enter subpage
Technologies Armored CoresKojima TechnologyMuscle TracersNEXTsNormalsPrimal ArmorSol Dios
Others CreditsEmblemsSoundtrackArmored Core: A New Order of "NEXT"Armored Core Designs 4 & for Answer
Arenas
PlayStation (1997-1999) Armored Core (1997) RankingsArmored Core: Project Phantasma ArenaArmored Core: Master of Arena Arenas
PlayStation 2 (2000-2005) Armored Core 2 ArenaArmored Core 3 ArenasSilent Line: Armored Core ArenaArmored Core: Nexus ArenasArmored Core: Nine Breaker ArenaArmored Core: Formula Front LeaguesArmored Core: Last Raven Arenas
PlayStation Portable (2004-2010)

Armored Core: Formula Front LeaguesArmored Core 3 Portable ArenasArmored Core: Silent Line Portable ArenaArmored Core: Last Raven Portable ArenasArmored Core (1997) Rankings

PlayStation 3 & Xbox 360 (2006-2013)

Armored Core 4 SimulatorArmored Core: For Answer Order MatchArmored Core (1997) Rankings

PlayStation 4, PlayStation 5, Xbox One, Xbox Series X and S, and Steam (2023)

ARMORED CORE VI FIRES OF RUBICON ArenaARMORED CORE VI FIRES OF RUBICON Nest (Online PVP)

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