The third installment in the ''DigimonWorld'' series, known as ''Digimon World 3'' in NTSC regions and ''Digimon World 2003'' for PAL regions ([[NoExportForYou since they never got]] ''DigimonWorld2''). The most significant difference is that in ''Digimon World 2003'', it is possible to continue after what is the finale of ''Digimon World 3''.

You play as a child called Junior who enters an online virtual reality MMORPG called "Digimon Online", which is run by the "MAGAMI" corporation. A terrorist attack on the Internet [[spoiler:(Or so it seems)]] traps Junior and his friends inside the game, and he sets out to stop them with his Digimon partners. The core gameplay is similar to many turn-based {{EasternRPG}}s.

!!This game contains examples of:

* AbsurdlySpaciousSewer: Beneath Asuka and Amaterasu City.
* ApatheticCitizens. Justified. Most of the tamers who are aware of what's going on have either been turned into Oinkmon or joined LaResistance.
* AuthorityEqualsAsskicking: Gee, the president of MAGAMI sure IS a battling champion.
* AwesomeButImpractical : Many finishers ultimately fall into this. Cool animations, but the damage is comparable to standard elemental moves that you can unlock and the finishers cost way more than those moves, sometimes they're even weaker than the standard attack. There's a lot of cases where a player wonders why their Mega finisher deals little damage after the DifficultySpike on Amaterasu Server.
* BalefulPolymorph: Oinkmon in general.
* BearsAreBadNews: Averted with Kumamon, one of the partner Digimon, and his digivolution of Grizzmon.
* BeefGate: You will encounter ''a lot'' of these in this game.
** The Knightmons in the Amaterasu Bridge are even worse. [[spoiler: Without the 4 colored cards, they can't be defeated at all. You can't even run away, ensuring you a game over.]]
* BossRush: [[spoiler:Kurt]]'s team consists of bosses from earlier in the game.
* BonusBoss. The six Black Megas, as fans affectionately call them.
* [[BreakingtheFourthWall Breaking the Fourth Wall]]: In Gunslinger's second floor, Junior looks at the camera and exclaims.
-->'''Junior''' "Hurry! We have to defeat Lord Megadeath and get everyone back!"
* {{BFS}}: Agumon, Veemon and Guilmon's equipable weapons.
* CatGirl: Persiamon.
* ChekhovsGunman: [[spoiler:Lucky Mouse]] and [[spoiler:Vemmon]].
* CombinationAttack: DNA evolutions could be called that, or maybe SummonMagic.
%%* CompetitiveBalance: (It's there, but TP placement can make anyone anything.)
* CoolShip: [[spoiler:Juggernaut]].
* CorruptCorporateExecutive: [[spoiler:The MAGAMI President]].
* CounterAttack: the Counter Crest, one of the challenge-killing accessories which was thankfully reimagined for the PAL version.
** Gallantmon's signature move is this. There's also Counter Strike.
* CueTheSun: [[spoiler:Amaterasu Server after the A.o.A. are eradicated]].
* {{Cutscene}}
* DarkWorld: Amaterasu server is this in relation to Asuka server.
* DemotedBoss: Digimon are often featured in tamer battles a few hours before they can be fought in random battles.
* DragonWithAnAgenda: [[spoiler:Snatchmon, literally]].
* DoesNotLikeShoes: Suzaku Leader, fitting to her oriental dancer outfit.
* DualWielding: Almost always better than a sword-and-shield combo.
* DynamicLoading: Well, the blue blocks that appear when the overworld graphics is loading is apparently this. Not that it's hidden, but...
* EarlyBirdCameo: Agunimon, [=KendoGarurumon=] and [=AncientGreymon=]
* EldritchAbomination: It's hinted that if [[spoiler:Galacticmon merged with the Earth]], the Digimon called Gaiamon would have been created. This would not only have killed all humans but also made the most powerful Digimon to have ever existed. Just think that over a bit. Then again, [[spoiler:Galacticmon]] can itself be considered one, being the merged consciences (for lack of a better world) of [[spoiler:Megadeath]] and Snatchmon combined with a giant KillSat and multiple forms with which to kill you.
%%* ElementalPowers
%%** AnIcePerson
%%** BlowYouAway
%%** CastingAShadow
%%** ExtraOreDinary
%%** MakingASplash
%%** PlayingWithFire
%%** ShockAndAwe
* ElementalRockPaperScissors. When you realize it's there, you will be almost done with the adventure. But players that can strike weak points ForMassiveDamage will feel a lot better.
* EverythingsBetterWithDinosaurs: [=MasterTyrannomon=] is one of the earliest bosses. Mercifully, he's weak to ice-type attacks (or failing that, one of Cannondramon's specialty moves). Not to mention he's found in an area filled with dinosaur Digimon.
* FinishingMove: All playable Digimon have a finisher, as do a few of the bosses.
* FetchQuest: Leads to...
* FishingMinigame: The only way, other than ''not'' having a full party of three, to cut on the time spent on...
* ForcedLevelGrinding. You can go from pwning in one area to being pwned on the next in less than 10 minutes of game time.
* GameplayAndStorySegregation: You can use Submarimon and Digmon as transportation, even though you have no way of getting hold of an Armadillomon partner.
* GentleGiant: [=BlackWarGrowlmon=], found in Amaterasu Server's Dum Dum Factory, is a dark recolor of what is already a Virus-type cyborg dragon worthy of the Digital Hazard symbol. He is also extremely nice and polite, only fights you because he wants to play (and not it a [[PsychopathicManchild twisted]] way, either) and after the battle, he cheerfully thanks you for the good match and gives you Hazard Armor, Guilmon's [[InfinityMinusOneSword Infinity-1 Armor]].
** All of the other Black digimons found on the Amaterasu server are this.
* GetOnTheBoat: I mean, on Submarimon.
* GiantSpaceFleaFromNowhere: [[spoiler:Armageddemon]].
* GroinAttack: There are two variants of Numemon, purple and icy blue, whose only attack is biting your Digimon right in that spot, especially if you fight them as [[OurAngelsAreDifferent Angemon, HolyAngemon, or Angewomon]]. The purple ones' attack will also reduce your Digimon's defense, so it's pretty dangerous.
* GuideDangIt: To get the fishing pole, you must talk to the fisherman Tai Kong Wong at Shell Beach and he will tell you to bring him a pole, string and a hook. While the hook is easy enough to get (you get it from an NPC), the pole and string may cause some head scratching. The "pole" in this case is [[BladeOnAStick Bamboo Spear]], a relatively cheap weapon you can buy from vendors. While its description mentioning that it is "like a pole" ''may'' be considered enough of a hint, the "string" is next to impossible to figure out without a guide: it's Spider Web, a RandomDrop from Dokugumon. It's an in-battle item that lowers the opponent's speed and ''nothing'' in the game hints at it being the string Tai Kong Wong is talking about.
** The Tree Boots, whose purpose is more or less identical to the fishing pole's, qualifies too. You begin the SideQuest by approaching an NPC in Plug Cape, who sends you to find a Gabumon card he lost. While he says that he thinks he lost it at Asuka Inn, to find it you must check a shelf that does not even look interactable, being a part of the background. After you return the card to the NPC, he tells you that you must befriend Veemon to get the boots. To find Veemon, you must go to Lamb Chop in Asuka City and speak to the waitress there to learn that Veemon is at Wind Praerie. You run over there, find Veemon and end up playing a game of hide 'n seek with him. So where does he hide? Behind one of the Kicking Trees in Kicking Forest. Or rather, behind the ''leaves'' of the tree, making it impossible for the player to see him and forcing him or her to blindly mash X behind every possible tree. And woe betide you if you accidentally exit the forest, in which case you must run all the way back to Lamb Chop and speak to the waitress again to make Veemon appear at Wind Praerie!
* HamToHamCombat: [[spoiler:Megadeath and Snatchmon]].
* HelloInsertNameHere: [[JustifiedTrope Justified]]; you don't name the player character per say, but rather, you come up with a username for Digimon Online for him. And because Digimon Online apparently is such SeriousBusiness, even his closest friends refer to him by his made-up moniker instead of his real name. Baronmon also somehow learns of "Account Change" after you get [[spoiler: the Digi-Egg of Knowledge]], which allows you to change your Digimon partners' names, again justified by it being a gameplay feature of Digimon Online.
* HPToOne: The Ragnarok Cannon. God forbids you if your Digimon is slow and you are only using one.
* HumongousMecha: [[spoiler:Destromon]] and [[spoiler:Galacticmon, a HumongousMecha InSpace]].
* IJustWantToHaveFriends: [=WaruMonzaemon=]'s justification for attacking Lisa.
* ImprobablePowerDiscrepancy: Amaterasu server is home to Champion level Digimon ''stronger'' than Mega level ones on Asuka server.
* InfinityPlusOneSword. And wand, and claw, and gun...
** For Monmon, you can buy the Raven's Bow, which grants it several ''hundred'' attack power and the ability to confuse its enemies, before you've ever met Bulbmon.
* [[spoiler: {{Irony}}: The Amaterasu Server looks like a creppy night version of Asuka's. Amaterasu is the name of the Sun Goddess.]]
* KamehameHadoken: most Mega level mons' finishers.
* KillerRabbit: All joking aside, if you meet an Antylamon in the Ameratsu Server, you're screwed. It's not invincible per se, but it's pretty powerful.
* KillSat: [[spoiler: Gunslinger]].
%%* LaResistance
* LevelFiveOnix. There are many Ultimate and Champion digimons that aren't really strong at the begining of the game, such as Kuwagamon and Triceramon. When going to the West Sector and to the Amaterasu Server, the game inverts it. Many Champion-level digimon and sometimes even Rookie-level are stronger than an Ultimate that you fought at Asuka server.
* LimitBreak. The Blast Gauge, filled as your Digimon takes hits. When full, your monster skips to its next natural digivolution, heals to max and its finisher is usable at zero MP cost.
* LoadsAndLoadsOfLoading. Self explanatory.
* MagicKnight. Veemon, the only playable partner not in a starter pack. Seeing as his role is that of a pumped-up JackOfAllStats, it's understandable.
* MagikarpPower. Be aware of the Patamon, dude, or he will wind-slice you to hell.
* MetalSlime. Not really metallic, but Numemons of all colors are always swift and brutal to your own mons, regardless of evolution. Maybe to compensate them for their ButtMonkey role in the anime.
** Cardmon can only be encountered by using items obtained from [[SideQuest Side Quests]], they are always tougher than other Digimon in the same area, can "Curse" your Digimon's stats, weakening them (Curse also happens to be the only status condition in the game that lingers even after the end of a battle and higher level Cardmons can curse more than one stat) and can potentially flee from battle. On the other hand, they award more experience and Bits in addition to dropping powerful booster packs.
* MoreDakka: Armormon, Monmon's Ultimate form, is essentially a [[NinjaPirateZombieRobot robotic centaur outfitted with enough guns to take on a small army]]... and its Finisher has it ''fire every single one of them at the enemy''. Of course, there is no such thing as enough dakka... though Cannondramon, its Mega stage which is [[UpToEleven a giant dinosaur with cannons up the wazoo]] comes pretty darn close.
* MutuallyExclusivePowerups. Equipping weapons/armor with special effects will null those provided by accesories (yes, that's why your Counter Crest stopped working).
* MythologyGag: A Terriermon in the Asuka City inn murmurs "[[Anime/DigimonTamers Momentai]]" in its sleep.
* NeverSayDie: Averted generally, though the battles state your partners are KO'd or enemy Digimon are just defeated. [[FridgeBrilliance But Digimon never really die so it makes sense.]]
* NintendoHard: For some people.
* NowWhereWasIGoingAgain. It's very easy to get lost on what you were supposed to do or on who to talk to.
* PaintItBlack: All of the Ameratsu boss Digimon are the black colored versions of Digimon.
* PaletteSwap: Most of the Digimon you fight have alternate color versions who are usually stronger. The most extreme example is Numemon, who appears in at least four other colors. Subverted with Meramon and [=BlueMeramon=], who are separate Digimon.
* PlayableEpilogue: There, the ToBeAMaster plot kicks in again... * groans* .
* PointOfNoReturn: Amaterasu's Admin Centre is this in the American version.
* PurelyAestheticGender: Digimon are supposed to be genderless. Say that to CuteMonsterGirl Angewomon, Rosemon, Sakuyamon or [[CatGirl Persiamon]].
** It makes more sense to say "sexless." Digimon definitely have genders, but they're functions of the Digimon's data instead of DNA. And since data is changeable, a Digimon's gender can change, particularly as it evolves. This game shows that with all the overlapping evolutions (Angewomon being a common evolution, for example).
* RandomEncounters: They can (and ''will'') shoot up in difficulty if you are careless.
* RunDontWalk: Thankfully.
* SavePoint: Guardromon.
* SaveScumming: Saving as often as possible is recommended thanks to the ContinuingIsPainful described above. Can get a little irritating thanks to saving always taking ''30 full seconds'', not counting going through the menus.
* ScrewThisImOuttaHere: Junior & Co. enter Jungle Grave and soon encounter Zanbamon, they exchange words then fight. Upon making his attack, Zanbamon causes huge damage resulting in the Digimon currently in use automatically running away.
** You run away even if you can beat him, because you have to get Sepikmon's mask first, unfortunately.
** Bulbmon is a boss example, running away after having its health at critical point. Only at the first encounter though.
* SequentialBoss: Could apply to any tamer boss, but especially to [[spoiler: the assimilated satellite boss]].
* StandardStatusEffects: Surprisingly useful. If you manage to poison or confuse an opponent the battle is as good as won.
** The opposite can be true. If you get frozen, for example, you will have a chance of literally ''skipping the turn''.
* StupidityIsTheOnlyOption: At Byakko City. The "Tamers" in the gym are obviously evil, with their military uniforms, but you've no choice but to walk right into their trap.
* SwordOfPlotAdvancement: The Blue Card, needed to ride the gondola to the South Sector.
* ThemeNaming: The cities of Asuka and Ameratsu Server.
* TwoGuysAndAGirl: [[KidHero Junior]], [[TheSmartGuy Teddy]] and [[NeutralFemale Ivy]] also [[TeamMom Lisa]], [[ThoseTwoGuys Nick and Keith]]
* VictoryPose. Yeaaah, go get them tiger!
* VideoGameGeography / EldritchLocation: Mobius Desert. It's easy to get lost in it due to its atypical geometry, seeming endlessness, and the identicality of all its cells (except for [=NPCs=]). It is in fact a 4x4 toroidal grid, which may be exited only by moving in the right direction from the right cell.
* WakeUpCallBoss: Persiamon. You can easily curbstomp all other tamer battles until her.
** And before that, Byakko Leader.
* WhamEpisode: At first the game seems like a standard Pokémon knockoff... then when you beat the Seiryu Leader, exit to the real world gets shut down.
** Reaching the Asuka Western Sector, and meeting the A.O.A.
* YouALLLookFamiliar. Used by the Guilmon gang to MindScrew you over an important item.
* YourSizeMayVary: In the opening FMV, Beelzemon and Gallantmon are roughly the same height while Armageddemon towers over both (which is, more or less, true to the anime). In the game, Beelzemon's small, Gallantmon fills half the screen, and Armageddemon is significantly shorter than Gallantmon.