[[quoteright:256:http://static.tvtropes.org/pmwiki/pub/images/MegaMan4_Title_GoodQuality_1191.png]]
The fourth game in the ''VideoGame/MegaManClassic'' series for the NES. It was released in Japan in December of 1991, closely followed by a North American release in January of 1992. PAL territories didn't get it until nearly a year later, in December of 1992. It has since seen numerous rereleases, including the ''Rockman Complete Works'', ''Mega Man Anniversary Collection'', VirtualConsole, and PSN.

It had been about a year since the events of ''VideoGame/MegaMan3''. Dr. Wily had seemingly perished after the final battle, having been apparently crushed by the falling debris from his fortress. But the peace is short-lived when Dr. Light is contacted by a new MadScientist named Dr. Cossack, who has sent his own new breed of Robot Masters out to challenge Mega Man. Tired of Dr. Light recieving all of the recognition for his accomplishments while his have been ignored, Cossack intends to destroy Light's crowning achievement and then put his broken body on display for the whole world to see, as proof that he is the superior one.

However, once Mega Man had defeated Cossack's eight Robot mMsters and confronted the doctor himself, it's revealed that Dr. Wily is still alive, and had kidnapped Dr. Cossack's daughter, Kalinka, and forced him to use his robots to battle his nemesis. Mega Man defeats Wily, who escapes, and peace is restored once more.

Robot Masters:
* DWN-025: Bright Man, weak to the Rain Flush, gives the [[LightEmUp Flash Stopper]]
* DWN-026: Toad Man, weak to the Drill Bomb, gives the [[HostileWeather Rain Flush]]
* DWN-027: Drill Man, weak to the Dive Missile, gives the [[ThisIsADrill Drill Bomb]]
* DWN-028: Pharaoh Man, weak to the Flash Stopper, gives the [[ThePowerOfTheSun Pharaoh Shot]]
* DWN-029: Ring Man, weak to the Pharaoh Shot, gives the [[RingsOfDeath Ring Boomerang]]
* DWN-030: Dust Man, weak to the Ring Boomerang, gives the [[ExtraOreDinary Dust Crusher]]
* DWN-031: Dive Man, weak to the Skull Barrier, gives the [[HomingProjectile Dive Missile]]
* DWN-032: Skull Man, weak to the Dust Crusher, gives the [[CastingAShadow Skull Barrier]]

See also ''VideoGame/Rockman4MinusInfinity'', a [[GameMod ROM hack]] that plays like a love letter to the ''VideoGame/MegaManClassic'' series and Creator/{{Nintendo}} as a whole ([[VideoGame/{{Kirby}} some games]] [[VideoGame/{{Gradius}} in]] [[VideoGame/TheLegendaryStarfy particular]]).

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!!Tropes:

* AIBreaker: What makes Toad Man the [[ComplacentGamingSyndrome Player Preference]] for first Robot Master is that to use his [[AlwaysAccurateAttack Always Accurate Rain Flush]] he needs to do a RainDance, however if he's attacked before his dance is complete, it'll completely negate the attack. With careful timing, it's a simple task to defeat Toad Man without him getting off a single attack.
* AlwaysAccurateAttack: The Rain Flush, which acts like a SmartBomb. Best of all, it [[UnblockableAttack ignores all defenses]], including '''''Metall hats'''''.
* [[AmericanKirbyIsHardcore American Mega Man Is Hardcore]]: Compare the [[http://image.gamespotcdn.net/gamespot/images/box/4/4/4/563444_29033_front.jpg US Boxart]] with the [[http://image.gamespotcdn.net/gamespot/images/box/4/4/4/563444_59407_front.jpg European one]].
* AreaOfEffect: The [[HavingABlast Drill Bomb's]] explosion hits a larger area than the drill itself. Comes into effect against the second Wily Machine, which is weak against the explosion, butwill completely deflect all strikes with the drill itself, making for some tricky timing.
* AutoScrollingLevel: The third Cossack stage is one of these, a rarity in the series.
* {{Balloonacy}}: The Balloon item plays with this trope, making FloatingPlatforms out of large, red balloons.
* BarrierWarrior: Skull Man. You too, once you recieve his Skull Barrier.
* BehindTheBlack: After the first part of Pharaoh Man's stage, you have to drop down a crevice to continue, but jumping over it and going forward is how to get the Balloon Adaptor.
* BigBad: Dr. Cossack. [[spoiler:Until we learn that he was a pawn in [[BiggerBad Dr. Wily]]'s plans.]]
* BlackoutBasement: Parts of Bright Man's level become this if you shoot the 100 Watton enemies that fly through the area. Shoot a Dompan to turn the lights back on.
* BlindedByTheLight[=/=]StunGuns: Although it appears the Flash Stopper makes [[TimeStandsStill time stand still]], in reality what it does is flash an intense light that blinds and stuns enemies for a short time.
* BookcasePassage: How Mummiras appear; part of the wall will flip around to reveal them. Destroying them destroys said passage too, by the way.
* BossArenaUrgency: Mothraya destroys part of the floor with one of its attacks.
* BubblyClouds: Subverted somewhat with Ring Man's stage, which begins in a cloudy tower but then goes into space and is filled with hippos and small floating Saturn-esque enemies. Played straight with the third Cossack stage, which takes place in the sky above the citadel and where platforms are often obscured by clouds.
* BuildLikeAnEgyptian: Were you expecting Pharaoh Man's stage to be anything else?
* ChargedAttack: This is the first game that allows Mega Man to charge up his Mega Buster. The Pharaoh Shot is this too.
* CheckpointStarvation: An annoying one in Cossack Citadel 1 - dying against Mothraya will send Mega Man back to the midpoint of the level, ''not'' in the boss corridor.
* CollisionDamage: A Mega Man staple of course, but in this game you need to be extra careful. Enemies (especially bosses) dish out a ton of it, more than most games in the series. Heck, the Robot Masters themselves seem to be very fond of getting up in your face, as most of them actually use this as an attack strategy rather than using their own weapons.
* CraniumRide: Bright Man's stage has you ride robotic grasshoppers (Battans) over spikes on a few occasions. Pharaoh Man has a similar gimmick in his level with Hovers.
* DemBones: Skull Man and his stage appropriately have a bone motif. [[SkeleBot9000 Skeleton Joes]] are a recurring enemy in this level, and they also appear in the first section of Cossack Citadel.
** Wily Machine 4 also acts as the first Wily Machine in the series to use a skull motif.
* DenialOfDiagonalAttack: Averted by the Pharaoh Shot, which can be aimed diagonally; played straight with everything else.
* DiscOneFinalBoss: [[KidnappedScientist Dr. Cossack]], special note that this is the first Mega Man Classic game to [[HijackedByGanon pull this trick]].
* DiscOneFinalDungeon: [[GloriousMotherRussia Dr. Cossack's Citadel]].
* DistressedDamsel: Kalinka Cossack, who's being held hostage by...[[HijackedByGanon Dr. Wily]].
* DownTheDrain: Most of Toad Man's stage and part of the first Wily level. Dive Man's stage is either this or UnderwaterBase.
* DramaticThunder: Cossack's Siberian Citadel is introduced this way.
* DualBoss: The Cockroach Twins from Cossack Citadel 3.
* DummiedOut: Pharaoh Man's level was originally supposed to include a [[Art/TheSphinx Sphinx]] MiniBoss on the path to the [[{{Balloonacy}} Balloon Item]]. This boss did not make it to the final release, and the only data left of the Sphinx was the snake on his forehead, its chin, and some sort of sphere that Mega Man would have stood on during the battle.
* EverythingMakesAMushroom: Dr. Wily's fortress makes a skull-shaped mushroom cloud when it goes up at the end.
* FastTunnelling: Drill Man tunnels underground quickly using his [[ThisIsADrill many drills]].
* FloatingPlatforms: The Balloon item found in Pharaoh Man's stage makes these.
* {{Foreshadowing}}: Wily is only made aware of Proto Man's betrayal at the end of this game, which would lead to the plot of the next installment, [[spoiler:where Wily frames Proto Man, possibly as revenge]].
* GameBreakingBug: [[http://www.youtube.com/watch?v=-cXOfi2Y8PA It is possible to]] ''kill'' Dr. Wily as he's ejecting from his exploding Wily Machine if you fire the Rain Flush and time it just right, so the rain starts as he's flying out. However, doing this will mess up an EventFlag that ends the level, meaning you're stuck in that room, forcing you to reset. [[FridgeBrilliance Considering what's the point of entire series, this makes sense.]]
* GloriousMotherRussia: The Cossacks; {{Fanon}} has taken it UpToEleven.
* GrapplingHookPistol: The Wire, found in Dive Man's stage.
* [[HijackedByGanon Hijacked By Wily]]
* HomingProjectile: The Dive Missile. Many enemies such as Mobys and Kabatoncues use these against Mega Man as well.
* HoppingMachine: Toad Man. Most of the Robot Masters jump, but Toad Man's only mode of movement is to [[CaptainObvious hop around like a toad]].
** The Jumbig enemies "attack" by hopping towards Mega Man.
* HyperDestructiveBouncingBall: What the Super Ball Machine Jr. enemies fire; it's particularly destructive as it fires its giant bouncing balls through the narrow corridors of Skull Man's stage.
* InvulnerableAttack: Drill Man is invulnerable while drilling into the ground, Dust Man is invulnerable while using his VacuumMouth.
* JustInTime: Just as [[TheHero Mega Man]] is just about to finish off [[DiscOneFinalBoss Dr. Cossack]], unaware that Cossack is actually being forced to fight against his will, [[TheCavalry Proto Man]] teleports in with Dr. Cossack's kidnapped daughter, Kalinka, [[HijackedByGanon exposing Dr. Wily as the mastermind behind everything]].
* KidnappedScientist: Dr. Cossack by [[HijackedByGanon Dr. Wily]]
** [[IHaveYourWife I Have Your Daughter]]: How Wily got Cossack to do his bidding.
* LedgeBats: This game introduces Up 'n Downs, an annoying little enemy that hides in BottomlessPits and jumps out just as you're jumping over them, and can easily knock you in if you're not expecting them. Nearly every game after this has a variation of these guys.
* LosingYourHead: Mummira, the mummy robots from Pharaoh Man's stage (and Wily Castle 2), attack by using their mummy bandages to throw their heads at Mega Man.
* LuckilyMyShieldWillProtectMe: The Skull Barrier.
* TheManBehindTheMan: [[spoiler:Dr. Wily is the real BigBad of the game.]]
* MultiMookMelee: Wily Stage 1, which is full of Metalls and all their variations followed by....
** KingMook: The Metall Daddy, the boss of this stage.
* NephariousPharaoh: Pharaoh Man is one of the Robot Masters fought in this game. He's not an actual pharaoh, though he was originally built to explore pyramids. His stage begins as a ShiftingSandLand and progresses into a TempleOfDoom.
* NoobBridge: The Drill Bomb's remote detonation property (one of the reasons its one of the better "explosve" weapons in the series) is often overlooked (push B again before it hits its target). The second form of Wily Machine 4 is basically a test to see if you know about it.
* OffscreenStartBonus: In the first stage of Dr. Cossack's Citadel, there's a hidden E-Tank buried in the snow to the left of your starting point.
* OneWheeledWonder: Mono Roaders.
* PrecisionGuidedBoomerang: The Ring Boomerang - it's even in the name.
* QuicksandSucks: Part of Pharaoh Man's level involves this.
* RainDance: How Toad Man summons his acidic [[HostileWeather Rain Flush]], also his AchillesHeel as if he's interrupted before his dance is complete, [[AIBreaker it'll complete negate his Rain Flush]].
* RenegadeRussian: Subverted in the end; Dr. Cossack's actually a pretty decent guy.
* RevivingEnemy: The [[SkeleBot9000 Skeleton Joes]] in Skull Man's stage. Only a charged Mega Buster or Pharaoh Shot can destroy them (or by shooting them with the Flash Stopper).
* RingsOfDeath: The Ring Boomerang.
* ScaryScorpions: Sasoreenus are scorpion robots found just outside of Pharaoh Man's TempleOfDoom, emerging suddenly out of the [[QuicksandSucks quicksand]] to attack.
* SeaMine: Located in [[UnderwaterBase Dive Man's stage]].
* SharedLifeMeter: The game has the Cockroach Twins, two robots fought one after the other.
* ShoutOut: {{Mothra}}ya, the first Boss of Cossack's Citadel.
** [[SkeleBot9000 Skeleton Joes]] are quite similar to the [[NightOfTheLivingMooks Stalfos]] from Franchise/TheLegendOfZelda series.
* SkeleBot9000: The Skeleton Joes that inhabit Skull Man's stage are this. They even [[PullingThemselvesTogether reassemble]] if they're not totally destroyed by a ChargedAttack. And Skull Man himself, of course.
* SkullForAHead: Skull Man, obviously.
* SpreadShot: The Dust Crusher is of the Exploding Shot variant.
* SuperHeroOrigin: Mega Man's origin story had previously been AllThereInTheManual, but this game goes ahead and puts this in the game's intro.
* TeleportSpam: This is the first game where you fight Wily in his teleporting saucer, and he uses it in every game after this one too.
* ThisIsADrill: Drill Man, and by extension the Drill Bomb.
* TrappedInVillainy: Dr. Cossack. Sure, he's not threatened to death, but what about his daughter?
* UnblockableAttack: The Rain Flush hits all enemies on the screen, including shielded ones like Metalls hiding under their hats.
* UtilityWeapon: The Drill Bomb is the only weapon that can destroy hard walls in Dr. Cossack's Citadel.
* VacuumMouth: Dust Man will attempt to suck in trash ([[CollisionDamage and Mega Man]]) using the duct on top of his head.
* WarmUpBoss: Toad Man is the easiest boss this time around. [[AIBreaker He can't even attack you as long as you keep shooting him]].
* YouDirtyRat: The Rattons in Toad Man's [[DownTheDrain sewer stage]].
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