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[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/astro_boy_omega_factor.jpg]]
''Astro Boy: Omega Factor'' (Known in Japan as ''Astro Boy Tetsuwan Atom'': ''Atom Heart no Himitsu'') was based on ''Manga/AstroBoy'', released in 2004 for the UsefulNotes/GameBoyAdvance after the Anime's 2003 Reboot. It was developed by Creator/{{Treasure}} and Hitmaker and published by Creator/{{Sega}}. Many consider this game a massive aversion of TheProblemWithLicensedGames, and a fitting tribute to Creator/OsamuTezuka.

The storyline starts off by following the 2003 anime, but soon diverges from it by adding elements from several other Tezuka stories. Dr. Tenma, brilliant robotics expert, [[WeCanRebuildHim rebuilds his son as a robot]] after he is killed in a horrible car accident. When he realizes Astro is not a true replacement, he abandons Astro and [[DisappearedDad disappears.]] After being adopted by Dr. O'Shay, Astro develops a sense of justice and sets out to resolve problems plaguing the relations between humans and robots.

In terms of gameplay, this is a BeatEmUp where Astro can jump and air dash ([[InvulnerableAttack he's invincible while dashing.]]) Astro has a basic punch combo, although he may freely [[PunchedAcrossTheRoom kick enemies away]] or [[FingerGun fire a finger laser]].) He also has access to three special attacks that he can build energy for.

* [[WaveMotionGun The Arm Cannon]], easily the strongest weapon but leaves Astro wide open to attacks from behind.
* [[MoreDakka The Machine Guns]] mounted on his lower backside will clear the screen of all projectiles and temporarily [[SmartBomb stun all enemies]] but is the weakest.
* [[MegatonPunch EX Dash]] has the smallest area of effect and the hardest to aim. But Astro will attack while dashing, juggling enemies everywhere as he hits them.

There are also a few ShootEmUp levels where Astro exclusively flies. He relies on his finger laser for offense, but can dash and use his specials normally.

Despite excellent reviews, this game was mostly passed over for the Playstation 2 game developed by Sonic Team and this fell into obscurity. Those who did play the game though [[CultClassic loved it.]] The ''Astro Boy'' game for the UsefulNotes/NintendoDS based on the American CGI film is inspired by this one, but unfortunately it is widely considered to be inferior in every aspect.

!!Tropes used:
* AbsenteeActor: Oddly enough, gag characters Gourdski and Spider have no cameos in the game.
* ActuallyIAmHim: [[spoiler:Shadow is Sharaku and Blue Knight is the ex-president Rag who was thought to be dead, er, destroyed.]]
* AdaptationalNiceGuy: There's no mention of Tenma being negletful towards Tobio and he didn't sell Astro to a circus. His ambition to create a God-like robot is also ultimately portrayed in a positive light.
* AirJousting: The battle with Blue Knight.
* {{Atlantis}}: Mu, pretty much. [[spoiler:Rock]] remains in the past to try to save it, but it isn't shown if he succeeded in changing anything.
* BackFromTheDead: [[spoiler:Astro]] at the end of both loops, revived by Phoenix.
* BadassAdorable: Astro, Denkou, Pook and the list goes on...
* BadFuture: After a time travel adventure, [[spoiler: Astro Boy returns five years late to a world where the Robot War has left earth scorched and uninhabitable. His attempts to fight for justice in this environment are [[RocksFallEveryoneDies too little too late]]. On later cycles he narrows the error level down to a more manageable 3 months.]]
* BeatingADeadPlayer: In the moonbase stage, if you get killed, gravity will take a while to let Astro's body stay still on the ground. In the meantime, enemies will keep attacking Astro as if he were still moving.
* BigBad: Sharaku Hosuke.
* BoringButPractical: The spin kick that ends a combo and blows most enemies away can be used anytime and the super moves that stun or severely damage all enemies on screen are often very spammable, ''so why is the game any difficult?'' Those moves are combo enders, so you'll end up instinctively using them only that way to build up full combos and rack more points [[DifficultButAwesome despite the risks]].
* BossBonanza: World's Strongest Robots.
* BossRush: World's Strongest Robots and World's Greatest Adventure.
** "World's Strongest Robots" pits Astro against the five strongest robots in the world. A change from the Manga, where Pluto fights the world's strongest.
** "World's Greatest Adventure" pits you against Magnamite, the Artificial Sun, and Carabs in one single stage. After that, you face off against Sharaku and [[spoiler:Garon]].
* BullfightBoss: With the Blue Knight.
* CharacterCustomization: The game gives no guidelines as to where to put your upgrades, but you'll max out by halfway through Rebirth if you find everyone. The only required customization is [[spoiler:having Level 3 Sensors when you get to Black Jack's house]].
** A word of advice: if you're playing on Hard Mode, don't bother upgrading your health more than one or two times. Instead, upgrade your Punch and Laser abilities first, so you can beat enemies more effectively. Having Level 4 or 5 Jets to avoid attacks better is also crucial; without decent-level Jets, Atlas and Sharaku are nigh impossible to beat. Once you've maxed out those three abilities, ''then'' you should work on maxing out everything else.
* CharacterDevelopment: Atlas, though this can be seen as "re-development".
* ChargedAttack: Astro's beam cannon, which conveniently freezes time while charging.
* ColorCodedForYourConvenience: You can tell the properties of each enemy by their color. Most importantly, Blue enemies fire projectiles and Red enemies have all attacks of their kind on top of not flinching to any attack but the machine gun.
* {{Combos}}: The game counts combos [[{{Cap}} up to 10]] and this acts as a score multiplier. However, racking that many hits is difficult because you're required to chain air dashes between each 4 melee attacks with great precision.
* CompositeCharacter: ''De rigeur'' for ''Astroboy'' adaptations.
** Rag and Blue Knight are merged into a single character and both he and Deadcross are now "played" by Rock, though originally they were just one-shot characters. Furthermore, Rock later [[spoiler:finds [[HeelFaceTurn redemption and love]] and decides to stay in Mu]], becoming the version of the character from the movie ''Marine Express''.
** Pook, the shape shifting robot from the ''Crucifix Island'' story is merged with Pick from ''MazinGaron'', while his working unwillingly for Skunk parallels Denkou (who also appears in the game but only as a minor boss with little role in the plot).
** Nuka combines elements from her original 80s anime incarnation as well as ''Prime Rose'''s Death Mask, Bem from the original series' ''Earth's Last Day'' storyline (humanoid control system for a weapon of mass destruction) and Mitchy &/or Tima from ''Anime/{{Metropolis}}'' (created on Duke Red's orders using the power of Omotanium, plugged into a machine that can affect the sun).
** Rainbow Parakeet is merged with Sherlock Homespun, the cyborg detective from the original ''Artificial Sun'' story.
** In terms of his fighting style, Montblanc is actually mostly Brando, a different character from the ''World's Strongest Robot'' saga, retaining only his namesake's beak-like facial features. Something of a necessity, as the original Montblanc was a pacifist who didn't even try to fight Pluto before being killed by him, whereas Brando was a robot wrestler but one wonders why they didn't just use him to begin with.
** Sharaku as the game's BigBad is mainly based on the EvilOverlord of ''Marine Express'' but in a post-ending scene, he becomes the original version of ''Manga/TheThreeEyedOne''.
** Shadow, a villain from the 2003 anime, appears in the BadFuture as the leader of the robots. [[spoiler: He turns out to be Sharaku in disguise.]]
* ContinuingIsPainful: Downplayed. Your score is reset upon continuing... but you're also given full life and special attacks (no doubt a relief considering this game's difficulty), in contrast to Treasure's ''Super Gunstar Heroes'' and ''Advance Guardian Heroes''.
* CrossOver: Starring Astro, with other characters from Creator/OsamuTezuka's [[ReusedCharacterDesign star system]] show as support characters and villains.
* CuteBruiser: Astro and Pook, the transforming robot.
* DefeatMeansFriendship: Blue Knight and the world's strongest robots on the timeline where they do not [[DefeatEqualsExplosion explode by Astro's fist]].
* DiscOneFinalBoss: Pluto is the final boss of Birth. He even has the same music as the TrueFinalBoss.
* DoesThisRemindYouOfAnything: Non-sexual variant. The robot/human conflict in the Antarctic appears ''very similar'' to the segregation debates and Civil Rights Movement in the 50's and 60's. As well it should, considering the original manga story it's based on was written during this period.
* DoNotAdjustYourSet: [[spoiler: Drake broadcasts his message to Nuka, ordering her to initiate the Death Mask and obliterate all robot-kind so her father won't die, on all world channels.]]
* DownerEnding: [[spoiler: The first playthrough ends with Death Mask killing Astro and all other robots on Earth. Fortunately, after this, the player is given the ability to shoot for a far less depressing ending.]]
* EarnYourHappyEnding: Astro has to use the Time Skip ''liberally'' in order to set right all that is wrong. He eventually achieves an ending far brighter than most versions of his story, with good outcomes for practically everyone.
* FinalBoss: [[spoiler:Garon controlled by Pook]].
* GiantMook: You'll often find both tiny and double-sized enemies through the game, which gets rather odd when it comes to the human ones. Naturally, their attack power matches their size.
* GrimyWater: Only at some points of the 2nd Stage and it seems to be normal water.
* GrotesqueCute: [[spoiler: Nuka while in Death Mask form. A disturbing face-shaped ship with her usual sweet personality.]]
* GroundhogDayLoop: Astro eventually gets the ability to warp to any point of time in the loop he wants to go.
* GuideDangIt:
** Some of the hidden Omega Factor characters are frustratingly hard to find. While Level 4 Sensors help (Astro will point out when a character is in a given segment), you'll still be spending a lot of time looking around. It doesn't help that at least one (Magma) is required by the plot.
** An entire subplot is initiated in a rather unintuitive manner: [[spoiler:by ''repeating the tutorial level'', since that's the only place barring cutscenes where Astro interacts directly with Dr. O'Shay (Astro will confront him about Dr. Tenma). Made worse by the fact that the game discourages you to do so to begin with by having O'Shay ask if you've forgotten the basic controls when you start]].
** The Blue Knight duel. You can't just press the button, you need to keep holding it down until the joust ends.
** Kennedy will only tell you the whereabouts of Dr. Black Jack after you [[spoiler: beat Blue Knight in the Antarctic duel, drive Sharaku off Fire Vase Island, and fight Atlas once more after hearing Drake's motive]].
** Figuring out how to damage North at all in his first phase. Hitting him only results in his arms blocking you, and using your laser causes him to unleash a powerful and nigh-unavoidable counterattack. You actually have to hit him first, and '''then''' use the laser on his eyes while one of his hands is still out.
* HaveWeMetYet: How Pook is introduced. Later on, when Astro is transported back in time to Mu, it's Pook who doesn't recognize him. And in the NewGamePlus, when you go back to the moment of their first meeting, they recognize each other.
* HitPoints: By the three-quarters point of Rebirth, they stop mattering, as enemies are often able to kill Astro in two or three hits anyway.
* HollywoodAtheist: One important quest has Astro proving wrong an archaeologist, Boon, who doesn't believe in anything that cannot be proved by science. [[spoiler:By calling up Magma who is very advanced and is somehow neither animal nor machine, according to Boon himself.]]
* IAmAMonster: [[TropesAreNotGood In a very bad way.]] Atlas describes himself as one in Birth.
-->'''Atlas:''' Just look at me! I'm neither fully human nor fully robot! '''I'm a monster.'''
* ImmuneToFlinching: Red enemies are never stunned by attacks (except for the machine gun). Purple enemies also have this property, but they are much rarer.
* JerkassFacade: This game's version of Dr. Tenma confesses that he [[spoiler:erased Astro's memories and left him to Dr. O'Shay because he realized from the beginning that Astro must become a hero to both mankind and robotkind instead of living as his son]].
* LetsYouAndHimFight: Astro fights several heroes[=/=]investigators who think Astro is a criminal, or they're the type who fight first and ask questions later.
* LevelUpFillUp: Adding someone to the Omega Factor restores your health. However, each health recovery only works once and this seriously unbalances the difficulty of subsequent playthroughs.
* LighterAndSofter: The game reads like a FixFic from people who felt bad for all the suffering Astro endured in the original manga and its animated adaptations, but his road to triumph is a hard one nevertheless.
* LoadsAndLoadsOfCharacters: This game includes many, many, many characters from Creator/OsamuTezuka's many works. Whenever Astro meets one he [[LevelUp gets to boost one of his stats.]]
* LuckySeven: Astro's Seven Super Powers are fittingly called his "[[VideoGame/GunstarHeroes Seven Forces]]" here. Pook plays the role of Seven Force in this game, but he only displays 4 forms in his boss battle regardless of difficulty mode and a fifth one later [[spoiler:as the final boss]].
* LuckilyMyShieldWillProtectMe: On Stage 6 there is no way to pierce the guard of enemies who are raising their shields.
* MassiveMultiplayerCrossover: Has all of Tezuka's characters as cameos.
* MultiMookMelee: So much the game lags A LOT because of it.
* MusicalGameplay: A minor example. While hitting enemies into each other does produce increasingly high-pitched xylophone sounds, they're not particularly synched to the music or anything else.
* NewGamePlus: [[spoiler:Literally. The entire second half of the game is reached after beating it once.]]
* NintendoHard: As in other Treasure games, you get a nice overpowered moveset but the enemies are relentless. On Easy you begin each life with, ridiculously, 30 Super attacks and can stock up to 99 of them and enemies deal very low damage. On Hard? Nightmare. Enemies will tear about half of your HP with the lightest of attacks, you can have only 3 Supers now and there are MANY things that can kill you in a single hit. Let's state that we are not talking about bottomless pits or death spikes. Rebirth Mode is tough on ''any'' difficulty. What's worse is that there barely are any recovery items in each chapter and some of them are supposed to be the level ups that only work once.
* NoFinalBossForYou: The first time through the game you cannot access the final stage. Finishing the game again lets you access TheVeryDefinitelyFinalDungeon.
* OffscreenStartBonus: [[spoiler:Kennedy, Unico and Mars]] are both just off-screen when you start certain areas.
* OneHitKill: Many enemies and most bosses in Hard Mode are this. Even in Normal mode, the giant roboid in stage 0-3 will kill you with one strike.
* PaletteSwap: The games does this with every single mook and even some mid/mini-bosses.
* PatrickStewartSpeech: Dr. Tenma delivers one in the good end, rousing Astro to lead humans and robots to a bright future. Before that, Manga/BlackJack delivered one to him, talking about the importance of emotions humans.
* PeggySue: After the first run through the game, [[spoiler: Manga/{{Phoenix}} saves Astro and grants him TimeTravel so he can SetRightWhatOnceWentWrong.]]
* PhlebotinumBomb: The Death Mask is capable of firing Omotanium-powered beams that destroy electronic components. It uses this to [[spoiler:exterminate all robots on Earth during the fist ending. This beam is an instant kill during the second fight against Sharaku]].
* PlotCouponThatDoesSomething: Time travel (the Stage Select) is how Astro saves the world.
* PresidentEvil: Rock starts off as this when he actually does become President of the Antarctic in the alternate timeline; he gets better though.
** Although technically not a President, Councilor Drake also counts.
* RobotWar: Who's winning depends on the timeline.
* RPGElements: Understanding a character's personality lets Astro unlock some of his true potential - health, attack power, number of times he can dash and how good his super senses are.
* ScoringPoints: The game has various high score and best time tables for each level on the three difficulties. It also records if you were able to beat an chapter or the entire game without dying. Your {{combo}} meter acts as a ScoreMultiplier which goes up to 10 (4 B hits, finger laser, special attack), so you should use your specials every now and then to their best effect.
* ShadowArchetype: At one point Astro claims that Atlas is this to himself, saying he's gone mad from his grief and sorrow as opposed to controlling his emotions as Tenma intends them to.
* SetRightWhatOnceWentWrong: [[spoiler:The second half of the game as Phoenix revives Astro and sends him back in time to make sure Death Mask doesn't activate and kill all the robots. With knowledge of the previous timeline, Astro does things a little different this time.]]
* ShoutOut:
** In addition to Tezuka works, the game is jam-packed with references to previous Treasure game ''VideoGame/AlienSoldier''. For examble, the Artificial Sun has been redesigned to resemble one of AS's minibosses and Mazin Garon fights almost exactly like Z-Leo.
** References to ''VideoGame/GunstarHeroes'' are also present: the background in one level features buildings that have signs reading "'''Gunstar'''", Pook refers to his different forms as "Forces" (similar to the ''Gunstar Heroes'' boss Seven Force), Astro's six main stats plus the Omega Factor are called "The Seven Forces", and the ending theme is a slightly slower version of ''Gunstar Heroes'''s ending theme.
** The Mu level has a secret alcove containing [[http://i.imgur.com/qyEh0Mz.png an enemy]] with a face exactly the same as the Clancers from ''VideoGame/MischiefMakers''.
* ShownTheirWork: We did say ''every'' character Tezuka ever did, right? The unlockable Character List gives descriptions of all the characters and explains how they were adapted into the game.
* SparedByTheAdaptation: Several examples thanks to the time loop. Notable examples include characters such as [[spoiler:Pluto and even Nuka!]]
* SolarCPR: [[spoiler:After the battle with the game's TrueFinalBoss, remains of it end up corrupting the sun. Astro has to send over a remnant of Death Mask/Nuka in order to restore it.]]
* StealthMentor: [[spoiler:Dr. Tenma's ultimate goal is to get Astro to become stronger by overcoming adversity.]]
* TacticalSuicideBoss: [[spoiler:Garon]] would be invincible if its pilot didn't occasionally open his cockpit to check on the outside for no reason.
* TalkToEveryone: In the second half of the game you'll need to do this. [[GuideDangIt You're bound to need a guide]].
* TimeTravel: The main element of the second half of the game.
* TogetherInDeath: [[spoiler:Astro and Nuka... [[BackFromTheDead or are they?]]]]
* UnexpectedShmupLevel: It ''is'' Astro Boy and the first shmup level appears early, so it is not that surprising. The final one plays a little differently, though...
* VideoGameDashing: Astro can cancel most of his moves into an invincible air dash, but it still has a small delay you must account for.
* WhamLine:
-->'''Duke Red:''' Nuka is with Death Mask now...Or should I say, [[spoiler: Nuka ''is'' Death Mask.]]
* WhamShot: The appearance of Death Mask, who then proceeds to ''destroy Astro and all robots on Earth''. Just when it seems that all is lost, you are given a second chance by the Phoenix.
* WhatIsThisThingYouCallLove: Astro gets a bit of this the first time he runs into Nuka.
* [[YouKilledMyFather You Killed My Daughter]]: Drake wants to [[FinalSolution destroy all robots]] because a robot killed his daughter, Prime Rose. [[spoiler: Not only did she not actually die, but her "killer" wasn't even a robot in the first place.]]
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