Explore the region you used to know and unveil the mysteries of the multiverse.
The first ever true multiplayer Ironmon Kaizo challenge, right in your browser (now on mobile too!).
A brand new co-op challenge
You're not alone anymore. Something strange happened and now you find yourself fighting along a friendly soul... But why are you the only one who can see it?
REAL CO-OP DOUBLE BATTLES
A soul-link establishes when you are outnumbered, allowing your partner to synchronize and fight with you in double battles.
HANG TIGHT IN LIMBO
Losing a battle does not mean it's over. You'll wake up in Limbo and your partner can battle to bring your spirit back. If they lose, the run ends for both.
CUSTOM LIVE TRACKER
A live tracker displays every info you need about you and your partner.
Quick start
Bring your own ROM
A legally obtained Pokémon Emerald (USA). It is patched in your browser and never uploaded: the game stays on your device.
Get your partner
Create a room and share the code to play with another player, or just add them in the friendlist and invite them. Once you are both in, you can start playing.
Start your adventure
Interact with your PC to start your adventure. Every time you load into a new game the random seed shuffles things up.
A world of features
And much more to discover!
CHARACTER SKINS
Unlock trainers' skins and show the world who you are. The skin will be displayed both in the game and in the profile card.

NOT EVERYTHING IS LOST
Several NPCs will offer to help you in different ways, and some of them can store items and currency for you to use in next runs.
EGG SYSTEM
Upon reaching certain milestones, you will find eggs of various types that will hatch after defeating a set number of trainers in battle, once put in an incubator. You can purchase additional incubators in your profile with Money stored in the vault.
Community first
UltraKaizo is a solo project and I playtest with the help of some friends. Join the community if you want to contribute in bug-reporting, suggesting new features and finding new friends to play with!