Credits

The game

• Pokémon Emerald by Game Freak, published by Nintendo and The Pokémon Company: the original game. UltraKaizo is a fan project and is not affiliated with them.
• pret/pokeemerald: the decompilation of Pokémon Emerald that everything is built on.
• pokeemerald-expansion by ROM Hacking Hideout and its many contributors: the Pokémon, moves, abilities, Mega Evolutions and battle mechanics of the later generations, and the data the tracker shows.
• pokeemerald-wasm by Tripp Lyons: the WebAssembly port our engine started from, used with the author's permission.
• pokeemerald-multiplatform by gradenGnostic and contributors, on the PC port by Kurausukun, NT_x86, Normmatt and camthesaxman: the sound engine that plays the game's music and effects in the browser.
• Emerald 3DS by Zallax and contributors: the voxel generators and the tree shapes behind the HD-2D view.

Art

• Pokémon sprites: the newer Pokémon's battle sprites and icons come with pokeemerald-expansion, from the community resources listed in its credits. Mega Evolution overworld sprites by princess-phoenix, larryturbo and kidkatt.
• Character skins: the extra trainer skins are fan-made sprites shared by the online Pokémon spriting community. If one of them is yours, tell us and we will credit you by name.
• Tracker icons: the type, badge and status icons come from Besteon's Ironmon-Tracker (MIT licence, notice below).
• Phantom bosses: recolors of the original game's trainer sprites.

Music

• ko-gy9by: the boss battle themes are their arrangements of music from the Pokémon series by Game Freak.

Fonts

• Archivo Black by Omnibus-Type
• Geist and Geist Mono by Vercel
• Jersey 10 by Sarah Cadigan-Fried
• Pixelify Sans by the Pixelify Sans Project Authors
• Silkscreen by Jason Kottke
• Press Start 2P by CodeMan38

Inspiration

• IronMON by iateyourpie: the challenge UltraKaizo is built around, Kaizo IronMON included.
• Ironmon-Tracker by Besteon: the tracker ours grew from.

Community

• taurine: creator and developer
• Moderators: Allerendys, Feels
• Bug hunters: Gallo, rafforeus, ReMidas, gik70

And every Early Access tester on Discord and Telegram: thank you.

Built with

Porymap, the pret build tools, LLVM, Bun, Next.js, React, tRPC, TanStack Query, Phaser, Zod and Tailwind CSS. Hosted on Vercel, Supabase, Fly.io and Cloudflare.

Licence notices

These projects are used under the MIT licence:

• Ironmon-Tracker: Copyright 2022-2023 Besteon
• pokeemerald-multiplatform: Copyright (c) 2026 pokeemerald-multiplatform contributors
• Emerald 3DS: Copyright (c) 2026 Zallax and Emerald 3DS contributors

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

The fonts are used under the SIL Open Font License 1.1. openfontlicense.org