Odyssey
COMPLETE · v4.1.1

The adventure goes deeper.

Pokémon Odyssey is PacoScarso’s story-driven FireRed ROM hack inspired by Etrian Odyssey. Join Nyx in the Yggdrasil Labyrinth.

Download & Patch Explore Pokédex

An independent fan guide to PacoScarso’s game.

YGGDRASIL FIELD JOURNAL
Nyx exploring a woodland trail in Pokémon Odyssey, surrounded by trees, rocks and spider webs
01 / Into the LabyrinthView gameplay
The game
Complete adventure
Latest patch
v4.1.1 · Expanded Bag
Platform
Game Boy Advance
ROM base
FireRed (U) 1.0
The entrance at the roots of Yggdrasil, with dialogue identifying it as the World Tree
The World Tree. Your way into the unknown.
01 / A different kind of Pokémon journey

No Gyms.
A whole Labyrinth.

Nyx joins the Adventurers Guild in Talrega to uncover the mysteries of Yggdrasil. Each Stratum takes her further into a world built around exploration.

Double Battles, Etrian Variants, and roaming F.O.E.s change how you build your team—and how you choose your next step.

Get your bearings
Meet the adventurers
Nyx portrait
NyxPlayer character
Aimée portrait
AiméeNyx's older sister
Ethan portrait
EthanNyx's companion
Olympia portrait
OlympiaNyx's companion
02 / Field notes

Forests to ruins. Towns to tough battles.
A look inside Pokémon Odyssey.

Game screenshots by PacoScarso & the Pokémon Odyssey team. Developer’s release post ↗

03 / Make every expedition count

A familiar world.
Different rules.

Read the game docs →
Xatu and Mightyena in a Double Battle against Dustox and Beautifly
Battle together

Two Pokémon. One plan.

Double Battles reward team synergy. Every Pokémon has perfect IVs, so you can focus on your build.

The game announces Eevee’s evolution into Yggdreon
Meet Etrian Variants

Familiar faces, reimagined.

Discover new forms and typings, including the Aether type. Start with the verified Pokédex entries.

Nyx exploring a stone dungeon corridor with a glowing blue design
Choose your next step

More than the main path.

Sidequests, gathering points, and Naval Exploration give you reasons to keep exploring.

04 / Your adventurer’s handbook

A little preparation goes a long way.

Meganium’s Etrian Variant shown in the in-game Pokédex
Build your team

Explore the Pokédex

Types, abilities, stats, and Etrian Variants.

 A leafy town with green-roofed houses in Pokémon Odyssey
Plan your route

Walkthrough & Strata

Level caps, bosses, and the road ahead.
01 Locations 02 Cheat codes 03 Game documentation
Your next adventure is ready

Ready to enter Yggdrasil?

The complete game. The official patch. Everything you need to get started.

Starting fresh? Choose v4.1.1. Keeping a v4.0.3 save? Check compatibility before patching.

Get the patch guide
Pokémon Odyssey II: Heroes of Lemuria
Beyond Odyssey / Demo available

Next stop: Lemuria.

Pokémon Odyssey II: Heroes of Lemuria is the next chapter. Find out what’s confirmed and what’s in the public demo.

Discover Odyssey II →
FAQ

Common questions

Is Pokémon Odyssey finished?

Yes — the developer confirmed directly on the official thread that the game was completed in June 2025. The current release is v4.1.1; only bug-fix updates are expected from here. See Versions & Changelog.

What do I need to play it?

A legally-obtained Pokémon FireRed (U) 1.0 ROM and the official .ups patch. Patch instructions and emulator setup guidance for PC, Android, and iOS are on the Download page.

Is Pokémon Odyssey II out yet?

Not as a full release. A public demo (0.1.3) is available. See Pokémon Odyssey II for what's confirmed so far.

Independent fan resource. Game and artwork by PacoScarso and the Pokémon Odyssey contributors. Not affiliated with Nintendo, Game Freak, or The Pokémon Company. Disclaimer & credits.