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Credits and licences

HOPPA stands on the work of many generous creators. Thank you. Everything the game plays or shows from a third party is listed here with its licence.

HOPPA is made by Alusoft, Australia.

Music

Every track is CC0 1.0, CC BY 4.0 or CC BY 3.0. Tracks: 55. The files were trimmed, levelled and re-encoded; nothing else was changed.

TitleArtistLicenceSource
Mist CitySection7CC BY 4.0opengameart.org/content/mist-city
Cyberpunk/Synthwave Project TrackNLVCC BY 4.0opengameart.org/content/cyberpunksynthwave-project-track
System Overloadtricksntraps (Alexander Ehlers)CC0 1.0opengameart.org/content/t-t-free-cyberpunk-pack-2
AI Fighttricksntraps (Alexander Ehlers)CC0 1.0opengameart.org/content/t-t-free-cyberpunk-pack-2
Wicked Beasttricksntraps (Alexander Ehlers)CC0 1.0opengameart.org/content/t-t-free-cyberpunk-pack
Vengeance ElectroOf Far Different NatureCC0 1.0opengameart.org/content/vengeance-electro
Technological IntegrationDavid J. BarriosCC BY 4.0freemusicarchive.org/music/david-j-barrios/single/technological-integration-la-integracion-de-la-tecnologia-cyberpunk-darksynth-metal-instrumental
runner2088wekontCC BY 4.0freemusicarchive.org/music/wekont/single/runner2088mp3
Cyborg DestinyZodikCC BY 3.0opengameart.org/content/zodik-cyborg-destiny
Lord of Zorg IZodikCC BY 3.0opengameart.org/content/zodik-lord-of-zorg-i
Vice PoliceTausdeiCC BY 3.0opengameart.org/content/vice-police
LightsTo ErisCC BY 4.0freemusicarchive.org/music/To_Eris/Escape_1609/Lights
UltraspeeedTo ErisCC BY 4.0freemusicarchive.org/music/To_Eris/Escape_1609/Ultraspeeed
DarkaroundTo ErisCC BY 4.0freemusicarchive.org/music/To_Eris/Escape_1609/Darkaround
PredatorDarkfluxxCC BY 4.0freemusicarchive.org/music/darkfluxx/single/predatormp3
Null FunctioncongusbongusCC BY 4.0opengameart.org/content/null-function
GT31000 HandzCC BY 4.0freemusicarchive.org/music/1000-handz/cc-by-free-to-use-gran-turismo-ep/gt3
Double PsycoreSoulbringerCC BY 4.0freemusicarchive.org/music/Soulbringer/Soulbringer/Soulbringer_-_Double_Psycore
Space BlockbusterSoulbringerCC BY 4.0freemusicarchive.org/music/Soulbringer/Soulbringer/Soulbringer_-_Space_Blockbuster
BitcrusherSoulbringerCC BY 4.0freemusicarchive.org/music/Soulbringer/Soulbringer/Soulbringer_-_Bitcrusher
Electric ExodusFoxSynergyCC BY 3.0opengameart.org/content/electric-exodus
Open WarfareRuskerdaxCC0 1.0opengameart.org/content/open-warfare
NeckstomperjoeBaxterWebbCC BY 4.0opengameart.org/content/neckstomper
Err0rjoeBaxterWebbCC BY 4.0opengameart.org/content/err0r
Surf RiotjoeBaxterWebbCC BY 4.0opengameart.org/content/surf-riot
TechnophobicFrederic LardonCC0 1.0freemusicarchive.org/music/Frederic_Lardon/Robots_Feelings/Frederic_Lardon_-_Robots_Feelings_-_05_Technophobic
Frog PunchGuifrogCC BY 4.0freemusicarchive.org/music/Guifrog/single/frog-punch
The Rigged Game (Instrumental Remix)Zander Noriega (zandernoriega.com)CC BY 4.0opengameart.org/content/the-rigged-game-instrumental-remix
Blown AwayKevin MacLeod (incompetech.com)CC BY 4.0incompetech.com/music/royalty-free/index.html?isrc=USUAN1200100
ExhilarateKevin MacLeod (incompetech.com)CC BY 4.0incompetech.com/music/royalty-free/index.html?isrc=USUAN1300028
Cool Hard FactsKevin MacLeod (incompetech.com)CC BY 4.0incompetech.com/music/royalty-free/index.html?isrc=USUAN1100280
RocketKevin MacLeod (incompetech.com)CC BY 4.0incompetech.com/music/royalty-free/index.html?isrc=USUAN1100568
Cyborg NinjaKevin MacLeod (incompetech.com)CC BY 4.0incompetech.com/music/royalty-free/index.html?isrc=USUAN1600008
Club DiverKevin MacLeod (incompetech.com)CC BY 4.0incompetech.com/music/royalty-free/index.html?isrc=USUAN1200020
OuroborosKevin MacLeod (incompetech.com)CC BY 4.0incompetech.com/music/royalty-free/index.html?isrc=USUAN1400007
Go CartKevin MacLeod (incompetech.com)CC BY 4.0incompetech.com/music/royalty-free/index.html?isrc=USUAN1300006
Basic ImplosionKevin MacLeod (incompetech.com)CC BY 4.0incompetech.com/music/royalty-free/index.html?isrc=USUAN1600032
MTAKevin MacLeod (incompetech.com)CC BY 4.0incompetech.com/music/royalty-free/index.html?isrc=USUAN1100631
The WreckZander Noriega (zandernoriega.com)CC BY 3.0opengameart.org/content/the-wreck
Fight Them Until We Can'tZander Noriega (zandernoriega.com)CC BY 3.0opengameart.org/content/fight-them-until-we-cant
The Recon MissionZander Noriega (zandernoriega.com)CC BY 3.0opengameart.org/content/the-recon-mission
Dragged Through Hellfire (Abomination)Zander Noriega (zandernoriega.com)CC BY 4.0opengameart.org/content/dragged-through-hellfire-abomination
Bestial Paragon InterfaceZander Noriega (zandernoriega.com)CC BY 3.0opengameart.org/content/bestial-paragon-interface
AbelianZander Noriega (zandernoriega.com)CC BY 3.0opengameart.org/content/abelian
ULTRA METALLoyalty Freak MusicCC0 1.0freemusicarchive.org/music/Loyalty_Freak_Music/HYPER_METAL_/Loyalty_Freak_Music_-_HYPER_METAL__-_04_ULTRA_METAL
GIGA METALLoyalty Freak MusicCC0 1.0freemusicarchive.org/music/Loyalty_Freak_Music/HYPER_METAL_/Loyalty_Freak_Music_-_HYPER_METAL__-_07_GIGA_METAL
MAXI METALLoyalty Freak MusicCC0 1.0freemusicarchive.org/music/Loyalty_Freak_Music/HYPER_METAL_/Loyalty_Freak_Music_-_HYPER_METAL__-_02_MAXI_METAL
Divergent TechnologiesDavid J. BarriosCC BY 4.0freemusicarchive.org/music/david-j-barrios/single/divergent-technologies-epic-melodic-deathcore
Guayota ReturnsDavid J. BarriosCC BY 4.0freemusicarchive.org/music/david-j-barrios/single/guayota-returns-progressive-djent-deathcore
The Fourth Industrial RevolutionDavid J. BarriosCC BY 4.0freemusicarchive.org/music/david-j-barrios/single/the-fourth-industrial-revolution-la-cuarta-revolucion-industrial-progressive-metal
Digital Mk. 2Tri-TachyonCC BY 4.0freemusicarchive.org/music/Tri-Tachyon/The_Spellbreaker_EP/Digital_Mk_2
CybershamanRuskerdaxCC0 1.0opengameart.org/content/cybershaman
Pixel DamnationYannZ (Yanni Ziangos)CC BY 4.0opengameart.org/content/they%E2%80%99re-going-down-%E2%80%93-game-ost-pack-by-yannz
Last Stand Lets GoNoah Cedeno (Peachtea)CC0 1.0opengameart.org/content/last-stand-lets-go
Summon the RawkKevin MacLeod (incompetech.com)CC BY 4.0incompetech.com/music/royalty-free/index.html?isrc=USUAN1200050

CC0 1.0 · CC BY 4.0 · CC BY 3.0

Sound effects

All CC0 1.0 (public domain), credited anyway: Kenney's sound packs (kenney.nl), and recordings from Freesound and OpenGameArt by the people below. The bosses' voices are original sounds designed from these recordings, and the Boss War's punchy layer is synthesized from scratch.

_justMonke_ (Freesound) · AGFX (Freesound) · ahnoj (Freesound) · Anuj_Shrestha1 (Freesound) · Aquafeniz (Freesound) · Archos (Freesound) · audible-edge (Freesound) · bbrocer (Freesound) · Beetlemuse (Freesound) · bevibeldesign (Freesound) · Bidone (Freesound) · BonginkosiMakhubu190225 (Freesound) · Brazilio123 (Freesound) · Breviceps (Freesound) · celldroid (Freesound) · cera.stes (Freesound) · CHallSmith (Freesound) · Christopherderp (Freesound) · CJspellsfish (Freesound) · corentin_faucher (Freesound) · craigsmith (Freesound) · csargent9 (Freesound) · DanJFilms (Freesound) · davdud101 (Freesound) · Dentrabert (Freesound) · derjuli (Freesound) · DeVern (Freesound) · DigestContent (Freesound) · DoctorMelon (Freesound) · dotY21 (Freesound) · dreamstobecome (Freesound) · duskstep (Freesound) · EagleStealthTeam (Freesound) · el_boss (Freesound) · eqavox (Freesound) · falcospizaetus (Freesound) · FALL-E (Freesound) · Filmscore (Freesound) · florianreichelt (Freesound) · genel (Freesound) · geoneo0 (Freesound) · georgesavic (Freesound) · harveyism (Freesound) · hnhnh (Freesound) · HonorHunter (Freesound) · husky70 (Freesound) · iainmccurdy (Freesound) · J3TTF (Freesound) · jamieorpen (Freesound) · Joao_Janz (Freesound) · k398jfks93hfbvk (Freesound) · kyles (Freesound) · lauramellis (Freesound) · LoafDV (Freesound) · loganzsound (Freesound) · LookIMadeAThing (Freesound) · LucasDuff (Freesound) · magnuswaker (Freesound) · Manim8 (Freesound) · martian (Freesound) · metrostock99 (Freesound) · Mish7913 (Freesound) · newlocknew (Freesound) · nocturnalvanguard (OpenGameArt) · nsstudios (Freesound) · Otterfox (Freesound) · OwlStorm (Freesound) · oztrum (Freesound) · Patrick_Corra (Freesound) · PhonosUPF (Freesound) · Podcapocalipsis (Freesound) · qubodup (Freesound) · Reitanna (Freesound) · Robo9418 (Freesound) · Roxis_Boy (Freesound) · rubberduck9999 (Freesound) · Rudmer_Rotteveel (Freesound) · RutgerMuller (Freesound) · SaintOche (Freesound) · SamsCollegeAccount (Freesound) · SamsterBirdies (Freesound) · sfx4animation (Freesound) · SignatureSoundsOrg (Freesound) · Soapuel (Freesound) · soundandmelodies (Freesound) · Soundburst (Freesound) · squareal (Freesound) · steaq (Freesound) · stuniverso (Freesound) · suonidigenova (Freesound) · tec_studio (Freesound) · Terry93D (Freesound) · ToaTom (Freesound) · Trancox (Freesound) · uagadugu (Freesound) · Userlover (Freesound) · wubitog (Freesound) · xenognosis (Freesound) · xoiziox (Freesound) · Zott820 (Freesound) · Zrte (Freesound)

Type

  • Unbounded (the HOPPA wordmark, as outlines) © 2022 The Unbounded Project Authors. SIL Open Font License 1.1.
  • Titan One and Rubik (the game's and this site's Latin type). SIL Open Font License 1.1.
  • M PLUS Rounded 1c © 2016 The M+ FONTS Project Authors; Chiron GoRound TC © 2025 The Chiron GoRound TC Project Authors; NanumSquareRound © 2017 NAVER Corporation (renamed HoppaRoundKR as a subset). SIL Open Font License 1.1.
  • Noto Serif KR, Black Han Sans, Jua and LXGW WenKai TC (Seoul's signs), Shippori Mincho B1 (Asakusa's lanterns), and Anton, Oswald, Bebas Neue, Playfair Display, Montserrat (the cities' parody ads). SIL Open Font License 1.1, subset and renamed as the licence asks.

Art and data

  • 3D models: generated with Tripo3D, then refined, re-textured and optimised in-house.
  • Signs, ads, hoardings and Seoul's mountain backdrop: generated locally with FLUX.1 [schnell] by Black Forest Labs (Apache License 2.0). Text-free images of fictional products and places; every brand in the cities is a parody.
  • Building material tiles: procedural, made in-house (CC0).
  • Elevation: Copernicus GLO-30 Digital Elevation Model, © DLR e.V. 2010-2014 and © Airbus Defence and Space GmbH 2014-2018, provided under COPERNICUS by the European Union and ESA.
  • Map data: © OpenStreetMap contributors, Open Database License 1.0 (the Seoul City Wall and the peaks). This website's world map: Natural Earth (public domain).
  • Live weather in the game: Open-Meteo.

Code

  • three.js r186 © three.js authors, MIT License; its KTX2Loader with ktx-parse and zstddec © Don McCurdy, MIT.
  • recast-navigation-js © 2025 Isaac Mason, MIT License; Recast & Detour © 2009 Mikko Mononen, zlib License.
  • Basis Universal transcoder © 2019-2025 Binomial LLC, Apache License 2.0.
  • HOPPA grew from the INKWAVE engine (MIT License, © 2026 Jayden Davis). HOPPA is an independent project.