CLICK THE BOX (OR PRESS Z) TO CONTINUE
Choose one Pokémon. Face a whole multiverse.
A randomized two-player kaizo challenge of Pokémon Emerald, right in your browser (now on mobile). You choose only one Pokémon to explore a world full of mysteries, and you will not be alone: every run is two players.
CLICK A REEL (OR PRESS Z) TO STOP IT
START A CO-OP RUN
Two players, two worlds. Bring a friend.
IN YOUR BROWSER, NO INSTALL
See it run
The real game, an Ironmon tracker reading it live, and the place you wake up when it goes wrong.
GENGARLV.40
SALAMENCELV.41
GARDEVOIRLV.39
AGGRONLV.40
DOUBLE BATTLES, TWO WORLDS
Boss fights snap both players into one battle: your mon and your partner's, side by side against the wall.
FLYGON LV.39
EarthquakePP 10/10
Dragon ClawPP 15/15
Rock SlidePP 10/10
CrunchPP 15/15
THE TRACKER READS THE RUN
A live Ironmon tracker: moves, abilities, stats and badge progress, no notes app on the side.
YOU FELL.
YOUR PARTNER FIGHTS TO PULL YOU BACK
LIMBO IS NOT THE END
Faint in co-op and you wake in Limbo while your partner battles to drag your spirit back. If they lose, the run ends for both.
SCENES COMPOSED FROM IN-GAME ASSETS
ONE SLOT, ONE PARTNER
One Pokémon fills your only slot. Faint and the run is over: no box, no backups, no mid-battle switch-ins. The multiverse may offer you a trade or a scouted replacement, but never a second slot.
EVERY SEED, A NEW WORLD
Each run reshuffles Hoenn underneath you. Stats, abilities, learnsets and evolutions all move. Gen 9 Pokémon and moves, mega evolution, and matchups that should not exist.
TWO WORLDS, ONE LIFELINE
Co-op snaps both worlds together for double battles. Fall and you wake in Limbo; your partner can fight to drag your spirit back. If they lose, you are both done.
TWO MINUTES TO A RUN
How a run starts
01
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.
02
Spin the device
Three random starters drift past. Pick one, and a fresh seed reshuffles the whole world around your choice.
03
Pull a friend in
Create a room, share the code. Two separate worlds, synchronized: boss fights snap you together for double battles.
THE VAULT SURVIVES THE RESET
What you get to keep
The world takes everything at the end of a run. Almost.
EGGS AND FOLLOWERS
Spend banked money on incubators and hatch followers that walk with you. They are collectibles: once hatched, they are yours across runs.
CHARACTER SKINS
Unlock trainers from across the games and pick who you are each run. Your partner sees them too.
THE VAULT REMEMBERS
Money you deposit survives the world's resets. Retrieve it when you need it most, or spend it on incubators, rerolls and Market items.
SOLO DEV, LIVE GAME
Bugs die fast here
UltraKaizo is a solo project and the dev plays it too. Report a bug on Discord and it usually dies within the day: the patch notes are the receipts.
SEASON LIVEv4.0.267