| iberia | 14 | Iberia | Locations entities |
| ibm1130 | 1 | IBM 1130 platform | Hardware themes |
| ibm1620 | 7 | IBM 1620 platform | Hardware themes |
| ibm360 | 19 | IBM 360 platform | Hardware themes |
| ibm5100 | 17 | IBM 5100 platform | Hardware themes |
| ibm650 | 1 | IBM 650 platform | Hardware themes |
| ibm701 | 1 | IBM 701 platform | Hardware themes |
| ibm704 | 3 | IBM 704 platform | Hardware themes |
| ibm7090 | 2 | IBM 7090 platform | Hardware themes |
| ibmsystem370 | 7 | IBM System/370 | Hardware series |
| ibomber-series | 7 | iBomber | Video game series |
| icaronycteris | 2 | Icaronycteris | Creatures entities |
| ice-theme | 9 | Ice theme | Video game themes |
| iceage-series | 20 | Ice Age | Cartoon series |
| iceaxe | 9 | Ice axe | Tools themes |
| iceclimber | 6 | Ice Climber | Video game series |
| icehockey | 125 | Ice hockey | Sport themes |
| iceland | 8 | Iceland | Locations entities |
| iceskating | 23 | Ice skating | Sport themes |
| icewinddale | 6 | Icewind Dale | Video game series |
| ichthyoids | 65 | Ichthyoids | Creatures themes |
| ichthyosaurus | 1 | Ichthyosaurus | Creatures themes |
| ico | 4 | Ico | Video game series |
| idaho | 14 | Idaho | Locations themes |
| identitycrisis | 22 | Identity crisis | Culture concepts |
| ideology | 13 | Ideology | Culture concepts |
| idiots | 8 | Idiots | Creatures themes |
| idleactivity | 24 | Idle activity | Video game concepts |
| idlenoise | 84 | Idle noise | Video game concepts |
| idler | 9 | Idler | Game genre themes |
| idtech1 | 28 | id Tech 1 | Software entities |
| idtech2 | 47 | id Tech 2 | Software entities |
| idtech3 | 86 | id Tech 3 | Software entities |
| idtech4 | 31 | id Tech 4 | Software entities |
| idtech5 | 14 | id Tech 5 | Software entities |
| idtech6 | 4 | id Tech 6 | Software entities |
| idtech7 | 4 | Id Tech 7 | Software entities |
| IFEengine | 2 | Interactive Fiction Engine | Software entities |
| ifv | 1 | Infantry Fighting Vehicle | Vehicles themes |
| igaprovincejapan | 1 | Location: Iga Province, Japan | Locations entities |
| igfgrandprizeaward | 19 | Award: IGF Seumas McNally Grand Prize | Video game entities |
| igfinnovationaward | 14 | Award: IGF Innovation | Video game entities |
| igfnominee | 48 | IGF finalist nominee | Other themes |
| ignorantprotagonist | 2 | Ignorant protagonist | Creatures themes |
| ignoredability | 1 | Ignored player ability | Video game themes |
| ignoredcompanions | 6 | Ignored companions | Video game concepts |
| ignoredvandalism | 5 | Ignored vandalism | Other concepts |
| igo | 150 | Go | Traditional entities |
| iguanodons | 3 | Iguanodons | Creatures entities |
| ikariwarriors | 26 | Ikari Warriors | Video game series |
| ikkitousen | 4 | Ikki Tousen | Cartoon series |
| ikko-ikki | 2 | Ikkō-ikki | Historical themes |
| ikusamegami-series | 4 | Ikusa Megami | Video game series |
| il2sturmovik-series | 14 | IL-2 Sturmovik | Video game series |
| illequipped | 126 | Ill-equipped | Other concepts |
| illinois | 24 | Illinois, USA | Locations themes |
| illusion-series | 13 | Illusion | Video game series |
| illusionarywalls | 44 | Illusionary walls | Other entities |
| illusionofgaia | 3 | Illusion of Gaia | Video game series |
| imagecomics | 8 | Image Comics | Culture series |
| imageteki5000-hw | 1 | Imagetek i5000 Arcade Hardware | Hardware entities |
| imaginarybeings | 18 | Imaginary beings | Creatures themes |
| imaginationnetwork | 3 | The Sierra Network | Other themes |
| imlacpds-1 | 2 | Imlac PDS-1 minicomputer | Hardware themes |
| immaterialrealm | 3 | Immaterial realm | Locations themes |
| immersivesim | 58 | Immersive sim | Game genre concepts |
| immobile | 7 | Immobile | Other concepts |
| immobilewater | 6 | Immobile water | Video game concepts |
| immolation | 1 | Immolation | Activities concepts |
| immoralstudy-series | 6 | Immoral Study | Video game series |
| immortality | 9 | Immortality | Other themes |
| immortalprotagonist | 50 | Immortal protagonist | Creatures themes |
| immortals | 35 | Immortals | Creatures entities |
| impactangle | 13 | Impact angle | Other concepts |
| impactjs | 3 | Impact | Software entities |
| impactshock | 1 | Impact shock | Other concepts |
| impartedmomentum | 7 | Imparted momentum | Video game concepts |
| imperfecthealing | 9 | Imperfect healing | Other concepts |
| imperfectrecovery | 6 | Imperfect recovery | Culture concepts |
| imperiumromanum | 113 | Imperium Romanum | Historical themes |
| impersonal | 61 | Impersonal | Video game concepts |
| implants | 34 | Implants | Other themes |
| implosionweapons | 7 | Implosion weapons | Tools themes |
| importedglitch | 7 | Imported glitch | Video game concepts |
| impossible | 3 | Impossible | Video game concepts |
| impossiblegeometry | 13 | Impossible geometry | Other concepts |
| impossiblemission | 28 | Impossible Mission | Video game series |
| impossibletasks | 6 | Impossible Tasks | Video game concepts |
| imprisoning | 42 | Imprisoning | Activities themes |
| imprisonment | 7 | Imprisonment | Video game concepts |
| improvisedweapons | 142 | Improvised weapons | Tools themes |
| imps | 42 | Imps | Creatures themes |
| impulsegoo | 38 | Impulse::GOO | Software entities |
| impulsereactor | 5 | Impulse::Reactor | Software entities |
| imuse | 19 | iMUSE | Software themes |
| inaccurateinfo | 21 | Inaccurate information | Video game concepts |
| inazumaeleven | 6 | Inazuma Eleven | Video game series |
| inbuilttraps | 111 | In-built traps | Other themes |
| incarnateddivines | 75 | Incarnated Divine Beings | Other concepts |
| incendiarygrenades | 97 | Incendiary grenades | Tools themes |
| incest | 17 | Incest | Other themes |
| inclinators | 13 | Inclinators | Vehicles themes |
| incompat-audioformat | 1 | Audio format incompatibility | Software concepts |
| incompat-ffdshow | 4 | ffdshow incompatibility | Software themes |
| incompat-intelgma | 1 | Intel GMA incompatibility issues | Hardware themes |
| incompat-multicore | 3 | Incompatibility: Multi-core CPU | Hardware themes |
| incompat-virtualization | 3 | Virtualization incompatibility | Software concepts |
| incomplete | 13 | Incomplete | Video game concepts |
| inconclusiveending | 5 | Inconclusive ending | Other concepts |
| inconsistentstyle | 10 | Inconsistent style | Other themes |
| incremental | 6 | Incremental | Video game themes |
| indeovideo | 2 | Indeo video codec | Software entities |
| independencewar | 10 | Independence war | Other themes |
| independentaim | 154 | Independent aiming | Video game concepts |
| indestructibleenvironment | 1 | Indestructible environment | Video game concepts |
| indevelopment | 451 | In development | Other themes |
| india | 64 | India | Locations entities |
| indiana | 10 | Indiana, USA | Locations themes |
| indianajones | 77 | Indiana Jones | Culture series |
| indianmythology | 4 | Indian mythology | Culture themes |
| indianocean | 7 | Indian Ocean | Locations themes |
| indicator-lead | 15 | Target lead indicator | Other concepts |
| indicator-noise | 20 | Noise indicator | Other concepts |
| indicator-poi | 57 | Point-of-interest indicator | Video game concepts |
| indicator-range | 34 | Range indicator | Video game concepts |
| indicator-route | 33 | Route indicator | Other concepts |
| indicator-threat | 50 | Threat indicator | Other concepts |
| indicator-visibility | 32 | Visibility indicator | Video game concepts |
| indicator-vision | 1 | Vision indicator | Other concepts |
| indicators | 1 | Indicators | Video game concepts |
| indie | 5723 | Indie | Video game concepts |
| indiefund | 16 | Indie Fund | Other entities |
| indigenousresidents | 11 | Indigenous Residents | Other concepts |
| indirectcontrol | 66 | Indirect control | Video game concepts |
| indirectmultiplayer | 7 | Indirect multiplayer | Video game concepts |
| indochinawar | 1 | First Indochina War | Historical themes |
| indonesia | 3 | Indonesia | Locations entities |
| indoors | 490 | Indoors | Locations themes |
| indoorsoccer | 27 | Indoor Soccer | Sport themes |
| indulgence | 90 | Personal gain | Culture themes |
| industrial | 8 | Industrial theme | Other themes |
| industrial-setting | 102 | Industrial setting | Locations themes |
| industrialage | 6 | Industrial age | Historical themes |
| indycar | 18 | Indy car | Sport entities |
| ineptveteran | 81 | Inept veteran | Other themes |
| inertscenery | 31 | Inert scenery | Video game concepts |
| inexplicableinvolvement | 7 | Inexplicable involvement | Video game concepts |
| inexplicabletrajectories | 5 | Inexplicable trajectories | Video game concepts |
| infallible | 3 | Infallible | Culture concepts |
| infamous-series | 4 | inFAMOUS | Video game series |
| infantry | 134 | Infantry | Creatures themes |
| infectornator-series | 3 | Infectornator | Video game series |
| infernalengine | 6 | Infernal Engine | Software entities |
| infestation | 11 | Infestation | Other concepts |
| infidelity | 6 | Infidelity | Activities themes |
| infighting | 6 | Infighting | Video game concepts |
| infiniteresources | 35 | Infinite resources | Other concepts |
| infinitespace | 9 | Infinite Space | Video game series |
| infinitezoom | 17 | Infinite zoom | Video game concepts |
| infinityengine | 24 | Infinity Engine | Software entities |
| infopropagation | 3 | Information propagation | Video game concepts |
| informlanguage | 4 | Inform programming language | Software themes |
| infravision | 11 | Infravision | Tools themes |
| ingameadvertising | 31 | In-game advertising | Video game concepts |
| ingamebrowser | 7 | In-game web browser | Software concepts |
| ingamecinematics | 54 | In-game cinematics | Video game concepts |
| ingameintro | 9 | In-game intro | Video game concepts |
| ingametitle | 353 | In-game title | Video game concepts |
| inherentright | 14 | Inherent right | Culture concepts |
| initiald | 15 | Initial D | Cartoon series |
| initiative | 59 | Initiative | Video game concepts |
| injuries | 103 | Injuries | Other themes |
| inorganics | 63 | Inorganics | Creatures themes |
| inpersoncinematics | 7 | In-person cinematics | Video game concepts |
| insaneasylum | 45 | Insane asylum | Locations themes |
| insaneengine | 24 | INSANE | Software entities |
| insaneprotagonist | 56 | Insane protagonist | Creatures themes |
| insectoid-theme | 43 | Insectoid theme | Other themes |
| insectoidmenace | 26 | Insectoid menace | Other themes |
| insectoids | 459 | Insectoids | Creatures themes |
| insectprotagonist | 135 | Insect protagonist | Creatures entities |
| insects | 261 | Insects | Creatures themes |
| insomniacengine | 1 | Insomniac Engine | Software entities |
| inspectorgadget | 9 | Inspector Gadget | Cartoon series |
| installer | 4 | Installer | Software concepts |
| installerarchfoul | 2 | Installer Architecture mismatch | Hardware themes |
| installjammer | 2 | Installjammer | Software themes |
| installoslimit | 15 | Install OS limit | Software concepts |
| instantdeath | 1540 | Instant death | Video game concepts |
| instantdeathprotection | 3 | Instant death protection | Video game concepts |
| instantkillers | 104 | Instant killers | Other concepts |
| instantmotion | 4 | Instant motion | Video game concepts |
| instantretry | 3 | Instant retry | Video game concepts |
| instantstart | 31 | Instant start | Video game concepts |
| insteadengine | 28 | INSTEAD Engine | Software entities |
| instructor | 13 | Instructor | Video game concepts |
| intangibleallies | 30 | Intangible allies | Video game concepts |
| intangiblefoes | 8 | Intangible foes | Video game concepts |
| intelextrememasters | 11 | Intel Extreme Masters | Other entities |
| intelligentanimals | 16 | Intelligent animals | Creatures themes |
| intellijidea | 1 | IntelliJ IDEA by JetBrains | Software themes |
| intellivoice | 6 | Intellivoice Voice Synthesis Module compatible | Hardware themes |
| intentionallybad | 12 | Intentionally bad | Other themes |
| intentionallybroken | 3 | Intentionally broken | Other concepts |
| interaction-vehicles | 1 | Interaction: Vehicles | Video game concepts |
| interactionhighlight | 47 | Interaction highlight | Video game concepts |
| interactivedialogs | 324 | Interactive dialogues | Other concepts |
| interactivefiction | 4545 | Interactive fiction | Game genre themes |
| interactivemovie | 67 | Interactive Movie | Game genre themes |
| interactivepurgatory | 28 | Interactive purgatory | Video game concepts |
| interactiveterminals | 13 | Interactive terminals | Video game concepts |
| interactivetriggers | 240 | Interactive triggers | Other entities |
| interbellum | 5 | Interbellum | Historical themes |
| interest | 21 | Interest income | Other concepts |
| interfacepuzzle | 1 | Interface puzzle | Other concepts |
| interfacespoilers | 28 | Interface spoilers | Video game concepts |
| intergalactictravel | 1 | Intergalactic travel | Activities themes |
| interlacedstereo | 1 | Interlaced stereoscopic 3D | Hardware themes |
| interlinkedlevels | 55 | Inter-linked levels | Video game concepts |
| intermissions | 71 | Intermissions | Video game concepts |
| internaldamage | 29 | Internal damage | Video game concepts |
| internalrepair | 14 | Internal repair | Video game concepts |
| internalvision | 15 | Internal vision | Other concepts |
| interplanetarytravel | 44 | Interplanetary travel | Activities themes |
| interquel | 6 | Interquel | Culture concepts |
| interrogating | 14 | Interrogating | Activities concepts |
| interrupting | 46 | Interrupting | Video game concepts |
| interspecificconflict | 195 | Interspecific conflict | Culture themes |
| interstate | 8 | Interstate | Video game series |
| interstellartravel | 26 | Interstellar travel | Activities themes |
| interwarperiod | 10 | Interwar period | Historical themes |
| intimidation | 27 | Intimidation | Activities themes |
| inuyasha | 9 | InuYasha | Cartoon series |
| invaderprotagonist | 1 | Invader Protagonist | Activities themes |
| invasion | 29 | Invasion | Other concepts |
| invasivespecies | 4 | Invasive plant species | Other entities |
| inventionvinvention | 1 | Invention versus Invention conflict | Other themes |
| inventory | 1763 | Inventory | Other concepts |
| inventory-indisposable | 26 | Inventory: Indisposable | Video game concepts |
| inventory-shared | 13 | Shared inventory | Video game concepts |
| inventory-supplies | 82 | Supplies in inventory | Video game concepts |
| inventory-unprotected | 7 | Unprotected inventory | Video game concepts |
| inventory-vehicles | 23 | Inventory: Vehicles | Video game concepts |
| inversekinematics | 41 | Inverse kinematics | Software themes |
| inversetime | 5 | Inverse time | Other concepts |
| investigation | 40 | Investigation | Activities themes |
| investigatorprotagonist | 388 | Investigator protagonist | Creatures entities |
| investing | 20 | Investing | Activities themes |
| investors | 16 | Investors | Other concepts |
| invincibilityframes | 27 | Invincibility frames | Other concepts |
| invisibleanatomy | 5 | Invisible anatomy | Cartoon concepts |
| invisiblefoes | 14 | Invisible foes | Creatures themes |
| invisibleplatforms | 24 | Invisible platforms | Other entities |
| invisiblewalls | 140 | Invisible walls | Video game concepts |
| invitebonus | 3 | Invite bonus | Video game concepts |
| invizimals | 6 | Invizimals | Video game series |
| involuntaryactions | 10 | Involuntary actions | Other concepts |
| involuntarystates | 8 | Involuntary states | Video game concepts |
| io | 24 | Moon: Io | Locations themes |
| ios-3 | 10 | iOS 3.x | Software entities |
| ios-4 | 5 | iOS 4.x | Software entities |
| ios-5 | 1 | iOS 5.x | Software entities |
| ios-6 | 2 | iOS 6.x | Software entities |
| ios-7 | 1 | iOS 7.x | Software entities |
| ios-8 | 3 | iOS 8.x | Software entities |
| ios-9 | 1 | iOS 9.x | Software entities |
| iowa | 6 | Iowa, USA | Locations themes |
| ipad | 66 | iPad | Hardware entities |
| iphone | 43 | iPhone | Hardware entities |
| ipod | 50 | Apple iPod platform | Hardware themes |
| ipodlinux | 1 | iPod Linux operating system | Software themes |
| ipodtouch | 13 | iPod Touch | Hardware entities |
| ipv4 | 3 | IPv4 | Hardware themes |
| ipv6 | 3 | IPv6 | Hardware themes |
| ipx | 63 | IPX network protocol | Software concepts |
| iquegba | 7 | iQue GBA | Hardware themes |
| iqueplayer | 14 | iQue Player | Hardware entities |
| iran | 6 | Iran | Locations entities |
| iraq | 17 | Iraq | Locations entities |
| iraqwar | 5 | Iraq War | Historical themes |
| irc | 12 | IRC | Software entities |
| ireengine | 4 | IRE | Software entities |
| ireland | 21 | Island of Ireland | Locations entities |
| iremm10-hw | 1 | Irem M10 arcade hardware | Hardware entities |
| iremm107-hw | 3 | Irem M107 arcade hardware | Hardware entities |
| iremm11-hw | 2 | Irem M11 arcade hardware | Hardware entities |
| iremm14-hw | 1 | Irem M14 arcade hardware | Hardware entities |
| iremm15-hw | 2 | Irem M15 arcade hardware | Hardware entities |
| iremm27-hw | 4 | Irem M27 arcade hardware | Hardware entities |
| iremm52-hw | 4 | Irem M52 Arcade hardware | Hardware entities |
| iremm57-hw | 1 | Irem M57 arcade hardware | Hardware entities |
| iremm62-hw | 12 | Irem M62 arcade hardware | Hardware entities |
| iremm63-hw | 2 | Irem M63 | Hardware entities |
| iremm72-hw | 11 | Irem M72 arcade hardware | Hardware entities |
| iremm75-hw | 3 | Irem M75 arcade hardware | Hardware entities |
| iremm79-hw | 1 | Irem M79 arcade hardware | Hardware entities |
| iremm82-hw | 2 | Iremm82-hw | Hardware entities |
| iremm84-hw | 3 | Irem M84 arcade hardware | Hardware entities |
| iremm85-hw | 1 | Irem M85 arcade hardware | Hardware entities |
| iremm90-hw | 3 | Irem M90 arcade hardware | Hardware entities |
| iremm92-hw | 13 | Irem M92 arcade hardware | Hardware entities |
| iremm97-hw | 2 | Irem M97 arcade hardware | Hardware entities |
| iremm99-hw | 1 | Irem M99 arcade hardware | Hardware entities |
| iriszoom | 16 | IRISZOOM | Software entities |
| irix | 36 | IRIX operating system | Software themes |
| ironage | 5 | Iron Age | Historical themes |
| ironengine | 4 | Iron Engine | Software entities |
| irongrip-series | 4 | Iron Grip | Video game series |
| ironicartwork | 10 | Ironic Artwork | Culture themes |
| ironictitle | 1 | Ironic Title | Culture themes |
| ironman | 20 | Iron Man | Culture series |
| ironsights | 90 | Iron sights | Tools themes |
| ironsky | 6 | Iron Sky Tie-in | Culture series |
| ironsky-series | 5 | Iron Sky | Culture series |
| ironwrap | 2 | SoftwareShield IronWrap | Software entities |
| irony | 4 | Irony | Culture concepts |
| irrklang | 14 | irrKlang audio library | Software themes |
| irrlicht | 32 | Irrlicht Engine | Software entities |
| isact | 1 | Interactive Spatial Audio Composition Technology | Software entities |
| isc-license | 2 | ISC License | Other concepts |
| ishar-series | 17 | Ishar | Video game series |
| ishinnoarashi-series | 11 | Ishin no Arashi | Video game series |
| isisconflict | 1 | ISIS Conflict | Historical concepts |
| island | 501 | Island | Locations themes |
| isolatedhabitat | 29 | Isolated habitat | Locations themes |
| isolatedlocale | 106 | Isolated locale | Locations themes |
| isolationists | 18 | Isolationists | Creatures themes |
| isopods | 5 | Isopods | Creatures entities |
| israel | 16 | Israel | Locations themes |
| iss | 24 | International Superstar Soccer | Video game series |
| itadakistreet | 7 | Itadaki Street | Video game series |
| italy | 101 | Italy | Locations entities |
| itch.io | 5074 | Available on Itch.io | Other entities |
| itech32-hw | 14 | Incredible Technologies System 32 | Hardware entities |
| itech8-hw | 15 | Incredible Technologies System 8 | Hardware entities |
| itembinding | 2 | Item binding | Video game concepts |
| itemcharges | 18 | Item charges | Other concepts |
| itemcomparison | 27 | Item comparison | Other concepts |
| itemcooldown | 13 | Item cooldown | Video game concepts |
| itemdurability | 158 | Item durability | Video game concepts |
| itemgenerator | 103 | Procedural item generator | Video game concepts |
| itemget | 97 | Item get | Video game concepts |
| itemglow | 356 | Item highlight | Video game concepts |
| itemglow-manual | 4 | Item highlight: Manually activated | Video game concepts |
| itemidentification | 87 | Item identification | Video game concepts |
| itemless | 2 | Itemless | Video game concepts |
| itemlock | 9 | Item lock | Video game concepts |
| itempickup-attract | 35 | Item pickup: Attract | Video game concepts |
| itempickup-auto | 130 | Item pickup: Automatic | Video game concepts |
| itempickup-delay | 1 | Item pick up: Delayed | Video game concepts |
| itempickup-global | 7 | Item pickup: Global | Other concepts |
| itempickup-ignore | 32 | Item pickup: Ignore excess | Video game concepts |
| itempickup-instant | 140 | Item pick up: Instantaneous | Video game concepts |
| itempickup-normal | 34 | Item pick up: Normal | Video game concepts |
| itempickup-scoop | 6 | Item pickup: Scoop | Video game concepts |
| itempickup-scrap | 2 | Item pickup: Scrap excess | Video game concepts |
| itempickup-stash | 1 | Item pickup: Stash excess | Other concepts |
| itemrecharging | 18 | Item recharging | Other concepts |
| itemrespawn | 15 | Item respawning | Video game concepts |
| itemsets | 43 | Item sets | Other concepts |
| ivalice | 8 | Ivalice | Locations concepts |
| ivalicealliance | 6 | Ivalice Alliance | Video game series |
| iwar-series | 2 | Independence War | Video game series |
| iwbte | 1 | I Wanna Be The Engine | Software entities |
| iwengine | 20 | Infinity Ward engine | Software entities |
| iz3d | 3 | iZ3D | Software entities |
