BIT — our builder, our product — stands on remarkable open-source work. The engines your games run on, the classics in the Arcade, the libraries, fonts, models, textures, sprites and sounds: they exist because people gave them away well. This page says thank you, precisely — and tells you which of them you need to credit when you publish a game of your own.
© 2014–present Godot Engine contributors; © 2007–2014 Juan Linietsky, Ariel Manzur.
Powers our 3D games on the web. Godot itself bundles further open-source components — see godotengine.org/license.
godotengine.org →© Phaser Studio Inc. (Richard Davey / Photon Storm).
The 2D engine behind BIT's browser games (Phaser 3).
phaser.io →© The Babylon.js team.
The 3D engine behind BIT's browser games. The full license and notice ship alongside our copy of the library.
babylonjs.com →The open-source classics on the Arcade shelf are complete Godot games by their original authors, ported to the browser unchanged. Each remains © its author, under the MIT license.
The homepage background is ARCADEBOX.AI's own — we don't stream third-party gameplay footage.
© Stuart Knightley and contributors.
Packages your game into a downloadable zip. Dual-licensed MIT or GPLv3; we use it under MIT.
stuk.github.io/jszip →© Mozilla Foundation and contributors.
Reads PDF reference documents you attach in the studio.
mozilla.github.io/pdf.js →Hanken Grotesk © Hanken Design Co. · DM Mono © Colophon Foundry · Inter © Rasmus Andersson · Chakra Petch © Cadson Demak · Press Start 2P © CodeMan38.
All under the SIL Open Font License 1.1, served from our own servers.
The models, textures, 2D sprites, skies, sounds and music beds BIT places in your game come from free asset libraries — 15,780 3D models, 1,988 texture sets and 2,621 sprites, plus sky domes, sound effects and music. Most of it is CC0: public domain, no strings. But 4,654 of the 3D models are CC BY 3.0, which is still free to use and sell — it just requires you to credit the person who made it. Here is exactly who made what, and what you owe them.
CC0 assets: you owe nothing. No credit line, no conditions. That covers 11,122 of the 15,780 3D models, all 2,621 2D sprites and all 1,988 texture sets — so most games land here and need no credits at all.
CC BY 3.0 assets: you must credit the maker. If your game uses one of the 4,654 CC BY models, name its creator somewhere people can see it when you publish — a credits screen, an about page, or a line in the README all count. Everything else is allowed: sell it, change it, ship it commercially. There are 774 different creators in that pool, so this is a list to keep, not something to remember.
You should not have to assemble that list by hand. Every model in our library records its licence and its creator's name in our public catalogue, arcadebox.ai/asset-catalog.json — look up the models your game loads and you have your credits. We are building this into the download itself, as a ready-made credits file naming only the creators your game actually uses; until that ships, the catalogue is the source of truth. If you would rather avoid the question entirely, ask BIT for CC0 models only.
Four models in the library are ARCADEBOX.AI's own, generated in-house. They ship with your game and need no credit.
The single biggest source in the library: 5,690 of the 3D models, every one of the 2,621 2D sprites BIT dresses 2D games with, and the retro / sci-fi sound packs (Digital Audio, Sci-Fi, Impact). All public domain.
kenney.nl →2,837 of the 3D models — characters, creatures, buildings, nature.
2,774 are CC0; 16 reached us through Poly Pizza under CC BY 3.0 and need crediting.
quaternius.com →395 models — the animated characters (knights, mages, skeletons) and the dungeon kits.
367 are CC0; 28 reached us through Poly Pizza under CC BY 3.0 and need crediting.
kaylousberg.com →7,722 models by hundreds of individual creators — Polygonal Mind, iPoly3D, CreativeTrio, Zsky, J-Toastie, Jarlan Perez and many more. This is where the CC BY models come from: 3,068 are CC0, and 4,654 are CC BY 3.0 by 774 named creators — including 1,500 from Google's retired Poly library.
If your game uses one of those 4,654, credit its creator by name. Each one's author is recorded against the model in our catalogue.
poly.pizza →1,988 photographic surface textures — the stone, grass, asphalt, brick, wood and metal that BIT paints onto ground, roads and walls. Public domain, no credit required.
ambientcg.com →The photographic sky domes (day, sunset, night, overcast, dusk, misty).
polyhaven.com →The looping music beds behind BIT's games, released to the public domain on OpenGameArt.
The playable arcade template "Norman the Necromancer" — a js13k game released into the public domain, remixable without limits.
github.com/danprince/norman-the-necromancer →The playable arcade starters "Brick Storm", "Rock Splitter", "Neon Serpent", "Alien Descent", "Skyline Dash", "Gem Swap", "Coin Dash", "Ironclad" and "Sky Hop" are clean-room ports of MIT-licensed reference games — rebuilt with our own art and sound, remixable without limits.
github.com/digitsensitive/phaser3-typescript →The playable "Elematter" tower-defense (js13kGames 2013) — an original open-source game, run unchanged. Sound via jsfxr (Apache-2.0) and riffwave (public domain).
github.com/jackrugile/elematter-js13k →The playable WebGL twin-stick shooter "Underrun" — MIT, with Sonant-X (zlib) synth audio and music by Andreas Lösch. Run unchanged.
github.com/phoboslab/underrun →The canonical original "2048" sliding-number puzzle, MIT — run unchanged (system font in place of the original webfont).
github.com/gabrielecirulli/2048 →The four-player "Ludo" board game with AI opponents — MIT. Run with a wired-up dice control and a smarter AI.
github.com/sausi-7/games →The 3D marble-maze "Astray" — public domain. Built on three.js (MIT) and Box2DWeb (zlib); its textures were replaced with procedural ones.
github.com/wwwtyro/Astray →The dimension-flip puzzle-platformer "ONOFF" (js13kGames 2018) — MIT, with TinyMusic (MIT) synth audio. Run unchanged.
github.com/starzonmyarmz/js13k-2018 →The one-screen arcade games "Thrust Deflect", "Hyper Laser", "Five Floors", "Stop the Count", "Slalom Run" and "Lob Shot" are built on ABA Games' crisp-game-lib and sounds-some-sounds (both MIT) — original samples, run unchanged.
github.com/abagames/crisp-game-lib →The atmospheric physics platformer "The Wandering Wraith" (js13kGames 2019) — MIT, with ZzFX (MIT) procedural audio. Run unchanged.
github.com/tulustul/The-Wandering-Wraith →The space tower-defense "Exo" (js13kGames 2018) — MIT, with CPlayer/Sonant-X (zlib) synth audio. Run unchanged.
github.com/js13kGames/exo →All third-party names, marks and logos belong to their respective owners — which is why you see wordmarks here, not logo images. Full license texts: MIT · Apache-2.0 · CC0 1.0 · SIL OFL 1.1 · CC BY 3.0 · CC BY-SA 4.0 · GPL. Nothing here implies endorsement of ARCADEBOX.AI by these projects.