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Video Game / Mega Man Battle Network 4: Red Sun and Blue Moon

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Mega Man Battle Network 4 is a video game created by Capcom for the Game Boy Advance in 2003. It's the fourth installment in the Mega Man Battle Network series. There are two versions: Red Sun and Blue Moon.

Five months after the previous game, Lan now goes to 6th grade, but evil is still on the loose, as a new threat lurks to cause chaos, so Lan and MegaMan.EXE must defeat it. At the same time, they participate in multiple NetBattle tournaments, all the while an asteroid is quickly heading to Earth.


This game provides examples of:

  • Adult Fear: Lan's doghouse alarm goes off and he rushes home to find his mother Bound and Gagged on the floor in the corner of his room and warned him that they could easily do worse. Let's go over that again: some creep (1) broke into his house, (2) attacked his mother, and (3) left a message taunting him about doing worse.
  • A.I. Breaker: ProtoMan is infamously vulnerable in the first encounter with him, as he only uses one attack from a specific position. Using an Area Grab will leave him helpless for the entire match. KendoMan is also known for having very flawed programming, even during his upgraded fights.
  • Artificial Stupidity: Enemy Navis on the first playthrough are slower, weaker, and in some cases use less attacks than they did in previous installments. ProtoMan in particular was downgraded viciously from his previous Perfect-Play A.I. strategy, leading to the AI Breaker listed above.
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  • Bag of Spilling: Justified, when Yuichirou returns the Navi Customizer to Lan and Mega. Turns out Haruka confiscated it from them to keep them out of trouble.
  • "Blind Idiot" Translation: Those two games have more translation messups and typos than any other installment in the series. For example, the new bad guy class of Heel navis is mistranslated as "Heal" navis, and the game is absolutely insistent on the specific phrase "viruses bust" for referring to the eponymous activity, even when it makes no grammatical sense (and it never does). Even the text formatting in the dialogue boxes is awkward.
    • "What a polite young man she was", regarding Lilly.
    • "Mega Man, is the jack out now!"
    • "There are so many electronic store!"
    • "Leg's go, Mega Man!"
    • "Want to saver you progress?"
    • "It's Phone!"
    • Many battlechips in the game have nonsensical and confusing descriptions, even accounting for the little space available for text.
    • The manual was also a mess.
  • Brick Break: In Blue Moon, Tamako attempts this on a large rock (and hurts herself somewhat) to drive a point regarding "fighting spirit" with Lan. She will refer MegaMan to a Cyberworld fighting master who has him break three of them within a short time limit, then challenges him to three rounds of this against MetalMan before the tournament battle.
  • Broken Aesop:
    • During the first tournament's prelims, Lan and MegaMan defend the Hidden Mettaur Village from a HeelNavi on the grounds that they "weren't doing anything wrong." However, in Match's scenario, they discover a virus in a malfunctioning grill, immediately assume it's causing problems, and delete it; they later learn that the virus was installed by Mr. Match to run the grill in the first place. Mr. Match argues that even viruses have their place, but Lan disagrees.note  While this could stem from Lan's suspicion towards Mr. Match after the FlameMan incident nearly cost his father's life in BN3, him not mentioning said event cancels that reason somewhat.
    • Also in the game, during the TopMan chapter, Lan discovers that NetBattling isn't merely "a game for the young" when they discover their opponent is a senior citizen. In the ColdMan Scenario, however, Ivan Chillski calls NetBattling "just a game", which causes Lan to blow a gasket and threaten to physically attack him.
    • While the game assumes you don't (and for good reason), using dark chips in the fourth game essentially invalidates its message in the finale. Sure, Megaman can't use dark chips against Duo and beat his dark side, but he still has the evil portrait, can't use light chips or Doublesoul, and can still use dark-aligned chips like Static.
  • Cash Gate: Expect to shell out money for things like passcodes, C-Slider parts and chips with specific codes that cannot be obtained outside from Chip Traders in order to progress through the story. Becomes very painful in the first playthrough, where the payouts from battles and Mystery Datas are ridiculously small compared to how much and how frequently the NPCs demand Zennys from the player.
  • Continuity Nod: These games are saturated with throwbacks to earlier games in the series.
    • Lan's introduction directly mirrors his intro from the first game, up to and including having to collect his PET from across the room after Mega wakes him up.
    • The tutorial sequence has Lan jack MegaMan in to an infected microwave, very much like the hacked oven from the FireMan scenario, also from the first game.
    • A handful of posters around ACDC Town feature images of Battle Network 3 characters, including Tadashii Hikari and Serenade.
    • During the BurnerMan scenario, he and FireMan get into a contest over which is the more Hot-Blooded that gets so out of hand that the entire internet is set ablaze, mirroring the FlameMan scenario from the third game; Lan's even gets the original water-gun program used in the hacked oven from the first game. (It's completely useless, however, and is soon replaced with something better).
    • The Hikari family's doghouse alarm system has usually featured a small local network that you could jack into for goodies; the alarm finally goes off during the events of the game.
  • Cooking Duel: Against Flave Yamakawa.
  • Crossover: The second trilogy of Battle Network features these with Boktai; Hideo Kojima himself cameos in Castillo late in the story, and MegaMan can encounter Django and Otenko in the depths of the internet.
  • Dangerous Device Disposal Debacle: Lan and Mega happen upon a special dark chip left behind by ShadeMan, and learn from Higsby that it's an Artifact of Doom. The game forgets about it during the first tournament, only for it to come up again in the interlude before the second, when ShadeMan decides he wants it back. The boys successfully prevent him from retrieving it, but at the cost of the dark chip permanently infecting Mega Man.
  • Excuse Plot: The majority of the game follows Lan and MegaMan as they participate in a series of tournaments consecutively, meeting quirky characters and helping them solve their own problems along the way. While there are two main sources of conflict in the form of an impending asteroid collision and the shady Nebula organization, the main duo have very little input in either storyline, as they only get involved in the former at the very end of the game; and only actively combat Nebula during short scenarios in between tournaments.
  • Fight Woosh: Strangely, the green lines fade-in effect for the tournament matches is the single unique one in the entire series.
  • Game-Breaking Bug: Being the series' worst offender of Obvious Beta, this game has a handful of them. The Virtual Console release fortunately fixed most of these problems:
    • The AquaMan and GutsMan Navi chips and the Park Area explored during WoodMan's scenario cause horrible loading slowdowns when played on emulators or an original model DS. The Park Area version of the issue is particularly onerous, since it can occur when leaving a random encounter or even saving the game. Technically the game has not broken; it "simply" temporarily freezes for as long as 20 minutes and will run normally afterward until you're forced to trigger another slowdown. Thankfully, this was fixed for the DS Lite, patches and AR codes have been developed by fans, and the emulators mGBA and NO$GBA have managed to finally solve the issue.
    • The Free Space battle board. If you link up with the other version before you have all six of the double souls (this means a New Game+ Plus at the very minimum) then your game will crash and corrupt the game's code. And by that we mean that it carries a high chance to permanently break it!
    • When Dr. Regal attempts suicide at the end, there's a dramatic slowdown when Lan and Chaud try to reach out for him. If the player skips the cutscene at this point in the Japanese version, the slowdown will carry over to the credits.
  • Gold-Colored Superiority: Duo Omega is unique among the powered-up final bosses in that he gets a Palette Swap signifying his status. The primary color is, of course, gold.
  • Guide Dang It!: The Meteor Computer has a gimmick where a cutscene will play at random intervals, showing MegaMan being sucked into a black hole and warped back to the area's entrance, effectively undoing all progress. What the game does not tell the player is that they are supposed to mash the A button whenever the cutscene is triggered, as doing so will enable MegaMan to resist the gravitational pull. If the player fails to realize this mechanic through experimentation or with the help of a guide, the final level can be rendered almost unwinnable.
  • Hand in the Hole: In order to prove that he's a contestant in the last tournament of the story, Lan has to put his hand in the mouth of a stone lion face. It threatened to bite his hand off if he wasn't who he said he was. It's actually a DNA tester.
  • Hero Ball: Lan holds it. He'd win over half of his tournament battles by default if he simply just stayed out of his opponents' lives.
  • Hopeless Boss Fight: ShadeMan.EXE for some turns, after which you're given a Dark Chip as a Desperation Attack that deletes him in a single hit — in the first play-through, at least. In later cycles of the story you fight against his upgraded versions, with enough HP that you have to hit him twice.
  • Horse of a Different Color: NetFrica (or at least the village Lan goes to) shows that ostriches become the primary transportation with no commentary attached.
  • Inevitable Tournament: This game consists almost entirely of three major tournaments (the closest things the games have to story are treated as B and C plots). The game hits you with a New Game+ that requires you to compete in all three all over again. (If you want to achieve absolutely everything, there are four cycles of the same story for you to pass through).
  • Karma Houdini: Almost every single opponent you fight that commits a crime seems to get off the hook one way or another. Take Ivan Chillski, for example, the self-absorbed prat who hacked government satellites in his own country to cause a blizzard in another (Capcom Science is very, very soft) for the sake of his own personal comfort; now, he gets arrested for this, and even gets a personal interrogation room in Netfrica for it, but is somehow freed and returned to his own country in time to make an appearance for the finale. Or take Paulie, from Netfrica, who nearly caused his village to die of thirst out of childish spite, and yet Lan personally asks for him to be forgiven when punishment looms its head.
  • Let's Meet the Meat: From ElecTown: "It's a sign of a cow recommending you eat beef... But what cow in their right mind would say that?!"
  • Oxygen Meter: Used during AquaMan's chapter in Blue Moon, when looking for him in the flooded net. This is refilled by stepping into a homepage.
  • Random Events Plot: This game is the straightest example of this trope, however, going so far as to have each scenario determined randomly by the tournament system. The game's events are so random, there's no required chronological arrangement (though some official guides behave as though the proper order is the Normal/Heel Navi fight, the Double Soul fight, and then the enemy Boss Battle). In fact, it deserves a Lifetime Achievement Award for this. The events themselves are nonsensical and have no bearing on the plot whatsoever. In the first tournament, you can exorcise a handful of troublemaking ghost Navis, or you can go beat up some roughnecks with a yankee named Tetsu. In the second tournament, you can rescue a Navi that wants to leave the mafia and go straight, or you can have an Iron Chef parody cook-off. In the third tournament, you can travel to NetFrica and participate in a fake village's fake festival worshipping a fake godnote  and then go stop one of the fake gods from killing everybody in the village from drought, or you can go play a few rounds of free kicks in soccer with heavy explosives.
  • Restored My Faith in Humanity: Duo seeks to wipe out mankind because it's wicked (nevermind the fact that destroying an entire planet isn't the most moral thing to do...) but changes after his fight with MegaMan.
  • Took a Level in Badass: You could end up facing Roll in the Electopia tournament (the second tournament you enter). By comparison, in the previous game, she had failed the last round of the N1 Grand Prix preliminaries and didn't even make the tournament proper. She makes use of what's stated to be her previously-existing speed, as well as a newly acquired (during the events of that game, even!) virus-taming and summoning ability. It's also the first time you get to fight her in battle.
  • Trailers Always Spoil: Not that they tried to keep the Big Bad much of a secret, but this trailer still doesn't help things.
  • Traveling at the Speed of Plot:
    • Once you are given access to airplane travel, suddenly traveling to countries around the world is done almost instantly. While it is convenient for gameplay purposes, it causes some logical issues when strict time limit is concerned, most notably during the KendoMan scenario where Lan asked permission to delay their match for what assumed to be a short time period so that he can bring back Mr. Famous who is held hostage in Netfrica. Electopia and Netopia are relatively closer, yet it takes half a day to travel by plane in the second game.
    • The asteroid is ridiculously fast for something that is supposed to be around Pluto in the introduction cutscene. It only took it around a month tops to reach Earth, meaning it has to be moving at a little less than 3 million meters per second.
  • Unwinnable by Mistake: There's ColdMan's scenario. The second phase of this scenario requires MegaMan to activate four different satellite dishes by sacrificing four fire chips, each a specific type and with a specific code. Woe unto he who does not have these chips because he fed them to a Chip Trader or traded them to a friend, because unless the Chip Trader decides to give them back, he's stuck. Be especially wary that this doesn't happen on the higher levels, where some of the viruses that drop these chips have disappeared from play.
  • Video Game Cruelty Punishment: Battle Network 4 treats using Dark Chips on your Navi as the equivalent of giving drugs to your own child, but there is nothing preventing the player from abusing their powerful effects in battle. However, MegaMan loses the ability to use Dark Chips just before the final boss. As a result, if the players had been relying on them for the entire game, they will be forced to tackle the last battle with a crippled HP, no access to Full Synchro or Soul Unisons and no attacks other than the basic buster and chips on the main folder.


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