->''Man's Battle for the Stars''

'''''2300 AD''''' is a science-fiction [[RolePlayingGame role-playing game]] first published by Game Designers Workshop ([=GDW=]) in 1986 as ''Traveller: 2300''. The game in fact had nothing to do with GDW's popular ''{{Traveller}}'' RPG, and when the system was revised in 1988 it was also re-branded as ''2300 AD''.

The setting is an extension of the background of GDW's ''{{Twilight 2000}}'' game, effectively showing what happened during the next 300 years. Mankind has started to spread into space, and faces its first major competition in the form of the Kafer.

''2300 AD'' was intended to be more "hard science-fiction" than GDW's ''Traveller''. Apart from FTL travel the typical trappings of SpaceOpera are mostly absent, and the game boasted a "Near Star Map" based on real stellar catalogues.

A d20 version called ''2320 AD'' was released in late 2007 as a campaign setting for the ''T20'' system.

Moongoose Publishing, a current producer of ''Traveller'' material, has also produced a set of sourcebooks that use the Mongoose version of ''Traveller'' as their core ruleset. Most of their material is revisions of the original game line.

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!!This game provides examples of the following tropes:

* TwoDSpace: Both averted and played straight. The map of human space is thoroughly and sometimes confusingly three-dimensional, but starship combat uses a flat map.
* AfterTheEnd: The entire game is AfterTheEnd for the earlier ''{{Twilight 2000}}'' game. ''300 years'' AfterTheEnd. Earth has recovered from the nuclear war, but the current balance of power between Earth's nations had its beginning in the Twilight War.
** During our Bronze Age, the Eber were a spacefaring civilization possibly more advanced than humanity is currently, with stutterwarp ships and three colony worlds. Then they had a nuclear war. The only survivors just barely re-invented the steam engine.
* AliensAreBastards: Averted. The aliens have very good reasons for acting as they do, even when they act like brutal psychopaths.
* AllPlanetsAreEarthlike: Averted. Most of them are actually quite a bit less hospitable than Earth.
* AlternateHistory: Since we didn't in fact have a nuclear war in the late '90s, ''2300 AD'' is an alternate history.
* ArtificialGravity: Averted. Human-built ships have spinning sections to simulate gravity, and no known species has anything different.
* AsteroidMiners: The ''Nyotekundu'' sourcebook/adventure is all about asteroid miners. Well, gas giant ring miners.
* AsteroidThicket: ''Nyotekundu'' features one in the cover art, although it's actually a gas giant ring. In the actual supplement the ring is described more realistically - you might see as many as three chunks of ice close enough to be more than a shiny dot.
* BackStory: The history between ''{{Twilight 2000}}'' and ''2300 AD'' was created by the designers by playing what they called "The Game" - a socio-political miltary simulation where each of the players took three or more nations and ran them at 5 or 10 year turns from 2000 to 2300.
* BalkanizeMe: Many nations of the 20th century didn't survive the Twilight War intact:
** Catalan became independent of Spain in 2013.
** China broke up into China, Canton, and Manchuria after the war and hasn't reunified.
** By 2050, India was 8 seperate nations: India, Rajasthan, Bombay, Mysore, Madras, Bengal, Bihar, and the Punjab. They haven't gotten back together and often war over territorial and religious differences.
** Texas is an independent nation and even has colonies on other planets.
** On the flip side of the trope, Germany wasn't re-unified until 2292, about 300 years after it happened in the real world.
* {{BFG}}: Plasma guns.
* BigCreepyCrawlies: The Kafer have some insectoid traits, hence the human name for them (German for "beetle"). The Xiang are also vaguely lobster-like.
* BinarySuns: A large portion of the systems on the ''Near Star List'' are double systems, and many human colony worlds therefore have two suns.
* BizarreAlienBiology: In keeping with their StarfishAliens status, all of the alien races have unusual biology when compared to humans.
* CasualInterstellarTravel: Partially averted. Humanity is still getting used to traveling among the stars, and starships are almost always owned by governments, corporations, or scientific foundations.
* CoolAirship: Blimps and zepplins have made a comeback, being used for cargo and passenger transport.
* CoolStarship: The American ''Kennedy'' class cruisers are the fastest ships in space and well-armed to boot. The French ''Suffren'' class cruiser that plays a central role in ''Mission: Arcturus'' might qualify as well.
* {{Cyberpunk}}: The Earth/Cybertech sourcebook introduced this into the setting, somewhat jarringly.
* CurbStompBattle:
** The Slaver War - humanity's first space war against an alien race. The Sung had solar sails and ion drives. Manchuria and Canada had stutterwarp ships. The Sung capitulated rather quickly.
** The War of German Reunification - France, already exhausted by the Central Asian War (2282 to 2287) got curb stomped by the Germans, with France itself nearly invaded, and were forced to allow German reunification. Until then France was pretty much the undisputed world leader.
* DeathWorld: Several of humanity's colony worlds are quite dangerous, and most of the outposts are on worlds without breathable atmospheres.
* DeflectorShields: Some starships have magnetic fields holding ablative particles in suspension that work like these, to protect against incoming lasers or particle weapons.
* DeterminedHomesteader: Many of Earth's colonists are these.
* EarthIsTheCenterOfTheUniverse: Earth is the center of human-controlled space, and the Kafer are the only other race known to control more than a handful of planets.
* EarthThatWas: a variant in one of the many little alien secrets known only to the GM: [[spoiler: the Ebers' mysterious "lost colony" is actually their original (nuked) homeworld.]]
* TheEmpire: France inaugurated the Third French Empire in 2298 (just 2 years before the setting), but France has really been ''the'' major power on Earth since the Twilight War. They're not necessarily evil, however.
* EverythingTryingToKillYou: Some of the planets humans have colonized are quite dangerous.
** Aurore in particular has acid-spewing crawling shag carpets and tree-sized mushrooms with foot-long claws that will try to eat humans even though we are deadly poisonous to them.
** Cold Mountain has flying blinds and burrowing rigatoni that try to kill you. Not to mention the flying hollow sharks full of glass knives...
* FantasticRacism: Between humans and aliens.
** Humans are viewed as boogeymen by the Kafer, while humans see Kafers essentially as space orcs.
** The Slaver War fought between Manchuria and Canada and the Sung was caused because the Sung believed they had a moral duty to enslave the more primative Xiang.
* FasterThanLightTravel: The stutterwarp drive "jumps" the ship instantly a few hundred meters, [[TeleportSpam and does it hundreds of thousands of times per second to reach faster-than-light speeds]]. It also has two built-in limitations. The drive rapidly loses efficiency in a gravity well; taking off from the surface of a planet or even maintaining orbit below a certain altitude via stutterwarp alone is impossible. In addition, ships must "discharge" their drives in a gravity well every 7.7 light years, or the drive will break down and produce large amounts of lethal radiation, killing the crew and stranding the ship.
* FirstContact: This has already happened a few times, and there was even a war fought (and won) against the Sung, but most of the races humans have met to this point are more primitive than they are. Some of the published adventures involve first contacts as well.
* FungusHumongous: Aurora features mushrooms that grow up to four meters high.
* GlobalCurrency: Averted. The French Livre is the unit used in the books, but each nation still has its own currency.
* {{Heavyworlder}}: The colonists on King have been genetically modified to survive in the heavy gravity there, and need rebreathers to survive in more earthlike (thinner) atmospheres. They are also short and immensely strong.
* HostileWeather: Present on many human colonies, and a theme in the adventure ''Energy Curve''.
* HufflepuffHouse: The French Arm was the main focus of the published materials and was the center of the Kafer War meta-plot. The Chinese Arm has three alien races in it, one of which is featured and further detailed in ''Ranger''. The American Arm, on the other hand, has one interesting high gravity planet and...not much else. It's just a dead end nobody else wants. [[spoiler:Until the adventure in Challenge magazine where a brown dwarf gives humanity a back door into Kafer space.]]
* HumansAreSpecial: Humans are one of the first races to develop the Stutterwarp drive in our part of space. Most of the other alien races encountered in the printed adventures and background are more primitive, like the Sung, or have regressed to a pre-spaceflight technology, like the Eber. Humans also control the largest number of worlds of all the races they've encountered. Humanity isn't ''too'' special though: the Kafer and Pentapods have also developed Stutterwarp and the Kafer control a small interstellar empire.
* InnocentAliens: The Xiang and the Klaxun are both stone-age primatives and relatively peaceful. The Xiang were enslaved by the Sung until the humans fought a war on their behalf and the Klaxun world is being scouted by the Kafer when humans first meet them. [[spoiler:The Ylii in the Kafer sourcebook and Challenge magazine, technically several related races and species forming a society together, have made themselves almost incapable of aggression after having nearly wiped themselves out in a genocidal war. It's this pacifism that has saved them from being completely eradicated by the Kafer. Kafer find it literally mind-numbingly boring to kill them and therefore find no urgency in killing or subjugating them.]]
* ISOStandardHumanSpaceship: Most human ships are indeed blocky, gray, utilitarian vessels, often with large spinning sections for gravity. In a possible subversion, Kafer ships are generally like this too.
* KineticWeaponsAreJustBetter: Most of the nations of Earth use high-tech assault rifles as their primary weapons, though they also have lasers.
* LivingShip: The Pentapods have these.
* MegaCorp: Several are in the game, and some are more or less beneavolent.
* TheMetricSystemIsHereToStay: The game uses metric units exclusively.
* MetaPlot: The Kafer war.
* MexicoCalledTheyWantTexasBack: During the Twilight War Mexico invaded the southern states and captured Arizona, New Mexico, and southern California (including LA). In 2300 they are still part of Mexico. Texas was conquered by Mexico too but successfully rebelled in 2099, becoming independent. Mexico also annexed all of the central American nations north of Panama during the 22nd century.
* MilitaryScienceFiction: A strong influence on the game, with several of the printed adventures centering around the Kafer War and putting the players in the roles of mercenaries or soldiers.
* MirrorChemistry: Many garden worlds have dextro-based biospheres, rendering their plants and animals inedible if not poisonous to humans. Colonists get around this by importing "pay dirt" from Earth; they then isolate and sterilize patches of ground, mix in the pay dirt, wait for the flora, fauna, and fungi that came with it to establish themselves, and start planting vegetables. Until the crops start coming in, however, it's food packs for breakfast, lunch, and dinner.
** In the ''Bayern'' module, characters who [[spoiler:enter the cluster nodes created by the AGRA Intelligence]] may end up mirrored due to [[spoiler:accidentally being rotated through the fourth dimension]]; fortunately, the ''Bayern'''s labs can provide dextro food to sustain them.
* MohsScaleOfScienceFictionHardness: On the hard side, with no artificial gravity, no FTL radio, and realistic aliens and lasers.
* NamingYourColonyWorld: Earth's colonies include just about all the variations.
* NoBiochemicalBarriers: Averted. Carnivorous life on Aurore finds Earth life to be dangerously poisonous, and vice versa. Unfortunately it usually finds out that humans are deadly only after it has taken a large bite out of one.
* NoWarpingZone: The stutterwarp's efficiency drops off greatly in a gravity well, meaning stutterwarp ships are still going really fast within a solar system, but no longer exceed the speed of light. They can just barely maintain orbit around a world.
* OneWorldOrder: Strongly averted. Earth still has about as many nations as it does today, and several worlds have the colonies of more than one nation on them. The Sung have multiple nation-states as well; at the time of first contact with humanity, "Akcheektoon" held primacy.
* OrganicTechnology: The Pentapods are big on OrganicTechnology, since their species evolved underwater and never had the option of using metal or fire in their industrial development.
* PlantAliens: The Klaxun of ''Energy Curve''.
* PlasmaCannon: The {{BFG}}s of the game.
* PoisonIsCorrosive: The animal life on Aurora (and some of the plants) make use of acids in attacking their prey. Because of incompatible biology these acids are also poisonous to humans.
* PoweredArmor: The major nations all have their own designs.
* ProudWarriorRaceGuy: The Kafer only really feel alive when they are in combat, and it actually makes them smarter. Their whole society is constructed around giving their citizens regular adrenaline jolts.
* PsychicPowers: Humans don't have them (apparently), but some of the aliens in the adventures do.
* {{Rancher}}: Many colonists are this.
* ScaryDogmaticAliens: The Kafer believe in using violence and pain to reach enlightenment, and it actually works for them. Unfortunately they think it works for everyone else too.
* ScienceFiction: Intended to be on the hard side.
* SettlingTheFrontier: A major theme of the game, with a lot of new frontier to settle.
* SlaveRace: Until we straightened them out, the Xiang to the Sung. [[spoiler:And the Ylii, to the Kafer.]]
* SpaceFighter: Handy in battle as launch platforms for missiles.
* SpaceMarine: Most nations have some, and the movie ''Aliens'' was an obvious influence on the game. American space marines are especially prominent in the adventure ''Mission Arcturus''.
* SpaceNavy: Also several. The board game ''Star Cruiser'' is all about space battles between them, usually involving humans fighting other humans.
* SpaceBattle: Until the Kafer war humans had only ever fought each other in space.
** Except that curbstomp of the Sung.
* SpaceElevator: Two of them - one on Earth and one at Beta Canum Venaticorum, which features in the adventure ''Beanstalk''.
* SpacePlane: Quite common.
* SpaceStation: There are several of these too.
* SplitPersonality: The Ebers have a "compartmentalized" mind, which effectively gives them all split personalities.
* StarfishAliens: All of the aliens in the setting are designed to be these.
* StealthInSpace: You can't hide a ship in space, but a major tactic in the space combat system is keeping your ships unidentified in order to confuse your opponent. Once they light up their sensors or get too close the jig is up.
* SubspaceAnsible: Averted. There is no means of communication faster than a stutterwarp ship.
* SufficientlyAdvancedAliens: [[spoiler:The AGRA Intelligence]] in the module ''[[spoiler:Bayern]]''.
* TankGoodness: The ''Vehicle Guide'' seems to focus more on military ''[[HoverTank hover tanks]]'' than civilian vehicles. AwesomeButImpractical?
* {{Terraform}}: Several human colony worlds are being terraformed to something a little more earthlike. It's going to take a long time.
* TidallyLockedPlanet: There are several of these in human space, the most prominant of which is probably Aurore.
* UnCanceled: The ''2320'' version and the Mongoose publishing version.
* UnitedEurope: Strongly averted. Europe's nations still can't get along with each other, although they have more or less cooperated in colonizing the French Arm.
* UnitedSpaceOfAmerica: Averted. Earth and its colonies are still divided between nations. The major arms of exploration are the French Arm (France, Britain, Germany, and other European nations), the Chinese Arm (Manchuria, Canada, Brazil and other South American nations), and the American Arm (America and Australia).
* {{Unobtainium}}: The stutterwarp drive makes use of Tantalum, and wars have been fought over Tantalum deposits.
* WeWillWearArmorInTheFuture: High-tech materials have made armor useful again.
* WhiteMansBurden: The Sung believe that advanced civilizations have a moral duty to dominate lesser civilizations and then educate them up to their level... and that the lesser civilizations have a corresponding moral duty to serve their educators. It wasn't their fault that the Xiang didn't ''want'' the advanced education and technology they were offering in exchange for their enslavement.
** And they don't understand why the humans are so reluctant, now that they have submited to human authority, to share the secret of stutterwarp. To them, humans have BlueAndOrangeMorality.
* WingedHumanoid: The Sung.
* WorldWarIII: A major part of the backstory.
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