RockmanCosmo
@rockmancosmo.bsky.social
Game preservationist who specializes in Japanese feature phone (keitai) games.
https://rockmancosmo.weebly.com/
https://rockmancosmo.weebly.com/
Pinned
RockmanCosmo
@rockmancosmo.bsky.social
· Oct 18
Welcome, new followers! I specialize in preserving Japanese feature phone (keitai) games. For 4 years, I've helped preserve hundreds of previously-lost keitai games, covering series like Mega Man to FFVII.
For more about me, here's a presentation I gave at the Strong Museum: tinyurl.com/3xyese5c
For more about me, here's a presentation I gave at the Strong Museum: tinyurl.com/3xyese5c
Today, the #Sega Alarm Clock Sound Sample was preserved! This app is dated to 2004, and it let you download Sega alarm melodies. There was even an online ranking of the most popular melodies! Unfortunately, our copy doesn't have any saved melodies, but you can browse the app.
February 6, 2026 at 12:16 AM
Today, the #Sega Alarm Clock Sound Sample was preserved! This app is dated to 2004, and it let you download Sega alarm melodies. There was even an online ranking of the most popular melodies! Unfortunately, our copy doesn't have any saved melodies, but you can browse the app.
Last year, LNRC partially preserved CROWS x WORST, a beat-'em-up keitai game based on the eponymous manga series. Today, @yuvi.app created a server, which made it playable for the first time! The game heavily relied on server data, so our copy is a small portion of the full game.
January 26, 2026 at 8:40 PM
Last year, LNRC partially preserved CROWS x WORST, a beat-'em-up keitai game based on the eponymous manga series. Today, @yuvi.app created a server, which made it playable for the first time! The game heavily relied on server data, so our copy is a small portion of the full game.
Gundam VS Fighting Spirits Plus, which was preserved last year, is finally playable thanks to @yuvi.app! The game needed a server to function properly. This may be the best keitai fighting game we've preserved so far. It runs incredibly smoothly for a keitai game.
January 24, 2026 at 8:15 PM
Gundam VS Fighting Spirits Plus, which was preserved last year, is finally playable thanks to @yuvi.app! The game needed a server to function properly. This may be the best keitai fighting game we've preserved so far. It runs incredibly smoothly for a keitai game.
Reposted by RockmanCosmo
Keitai World Launcher has been updated to Ver. B0.8.1!
✅ Added privacy policy acceptance
✅ Added M7 audio for KEmulator
✅ Added rotated dialpad option for landscape appli
✅ Packaged emus updated
✅ Updated default emulators
✅ Code optimizations
✅ Added privacy policy acceptance
✅ Added M7 audio for KEmulator
✅ Added rotated dialpad option for landscape appli
✅ Packaged emus updated
✅ Updated default emulators
✅ Code optimizations
January 23, 2026 at 1:14 AM
Keitai World Launcher has been updated to Ver. B0.8.1!
✅ Added privacy policy acceptance
✅ Added M7 audio for KEmulator
✅ Added rotated dialpad option for landscape appli
✅ Packaged emus updated
✅ Updated default emulators
✅ Code optimizations
✅ Added privacy policy acceptance
✅ Added M7 audio for KEmulator
✅ Added rotated dialpad option for landscape appli
✅ Packaged emus updated
✅ Updated default emulators
✅ Code optimizations
Reposted by RockmanCosmo
Keitai World Launcher has been updated to Ver. B0.8!
✅ New home screen with five random featured games and a list of recent additions
✅ Redirection of SIMPLE100 URLs
✅ New home screen with five random featured games and a list of recent additions
✅ Redirection of SIMPLE100 URLs
January 13, 2026 at 11:16 PM
Keitai World Launcher has been updated to Ver. B0.8!
✅ New home screen with five random featured games and a list of recent additions
✅ Redirection of SIMPLE100 URLs
✅ New home screen with five random featured games and a list of recent additions
✅ Redirection of SIMPLE100 URLs
Yeah, that was my close friend @unabandonware.bsky.social! That table was a smashing success, I'm glad you were able to experience this game on phone hardware!
January 13, 2026 at 10:03 PM
Yeah, that was my close friend @unabandonware.bsky.social! That table was a smashing success, I'm glad you were able to experience this game on phone hardware!
I finally beat #Rockman: The Puzzle Battle! This was preserved last year. The Wily bosses are brutally difficult, but the music remixes are nice. I'm playing on the English patch created by Penguinstrain, Yuvi, and Muttvil. Full video footage can be found in the replies!
January 13, 2026 at 6:26 PM
I finally beat #Rockman: The Puzzle Battle! This was preserved last year. The Wily bosses are brutally difficult, but the music remixes are nice. I'm playing on the English patch created by Penguinstrain, Yuvi, and Muttvil. Full video footage can be found in the replies!
Our efforts target all keitai games; DoCoMo just happens to be the carrier with the most archived games. One of our team members, Cuebus, has put a lot of work into chip-dumping Unabandonware's J-Phone devices. We'd love to see your small archive! You can reach out via @keitaiarchive.bsky.social.
January 13, 2026 at 6:14 PM
Our efforts target all keitai games; DoCoMo just happens to be the carrier with the most archived games. One of our team members, Cuebus, has put a lot of work into chip-dumping Unabandonware's J-Phone devices. We'd love to see your small archive! You can reach out via @keitaiarchive.bsky.social.
It's definitely coming back next year, so don't worry!
January 12, 2026 at 10:12 PM
It's definitely coming back next year, so don't worry!
Here's a comparison of how the games look with Irdkwia's plugin vs original hardware.
January 12, 2026 at 6:12 PM
Here's a comparison of how the games look with Irdkwia's plugin vs original hardware.
Dokodemo Chocobo 1 and 2 are now playable! Released in 2002, these are standby keitai apps and dungeon crawlers! Cuebus preserved them last year. They utilize Mitsubishi's proprietary Z3D graphics engine. The original Z3D plugin is lost, but Irdkwia recreated it with Mesa 3D!
January 12, 2026 at 6:10 PM
Dokodemo Chocobo 1 and 2 are now playable! Released in 2002, these are standby keitai apps and dungeon crawlers! Cuebus preserved them last year. They utilize Mitsubishi's proprietary Z3D graphics engine. The original Z3D plugin is lost, but Irdkwia recreated it with Mesa 3D!
Reposted by RockmanCosmo
#MAGFest: I've spent 2.5 years preserving games from Japanese feature phones with a small online group, mostly isolated, trying to convince people that these games are important. It feels like, finally, people understand. Words cannot describe how great it feels. Thank you for the opportunity ❤️
January 10, 2026 at 7:08 PM
#MAGFest: I've spent 2.5 years preserving games from Japanese feature phones with a small online group, mostly isolated, trying to convince people that these games are important. It feels like, finally, people understand. Words cannot describe how great it feels. Thank you for the opportunity ❤️
By a big margin...
Fire Man is the only problem in Puzzle Battle... in Mickman 39, the whole game is the problem! 🤣
Fire Man is the only problem in Puzzle Battle... in Mickman 39, the whole game is the problem! 🤣
January 9, 2026 at 5:20 PM
By a big margin...
Fire Man is the only problem in Puzzle Battle... in Mickman 39, the whole game is the problem! 🤣
Fire Man is the only problem in Puzzle Battle... in Mickman 39, the whole game is the problem! 🤣
This game took years off my life and it will take years off yours too! Might be the hardest game on display...
January 9, 2026 at 5:17 PM
This game took years off my life and it will take years off yours too! Might be the hardest game on display...
The i-mode website, which hosted i-mode game storefronts, shut down in 2021. The remaining pieces of the i-mode service don't pertain to games, so the total shutdown in April won't impact them.
January 9, 2026 at 4:05 PM
The i-mode website, which hosted i-mode game storefronts, shut down in 2021. The remaining pieces of the i-mode service don't pertain to games, so the total shutdown in April won't impact them.
Don't worry, this definitely won't be the only time this happens! We're already aiming to have this display return next year, based on the overwhelmingly positive reception. Maybe even other conventions too!
January 9, 2026 at 1:54 AM
Don't worry, this definitely won't be the only time this happens! We're already aiming to have this display return next year, based on the overwhelmingly positive reception. Maybe even other conventions too!
That was me! I'm glad I was able to introduce you to them 🙂
January 8, 2026 at 11:09 PM
That was me! I'm glad I was able to introduce you to them 🙂
These games are operable forever because they're preserved. They aren't tied to a service
January 8, 2026 at 6:02 PM
These games are operable forever because they're preserved. They aren't tied to a service
Are you at MAGFest? Want to try some preserved keitai games? You're in luck! Come to the Museum/LAN Room and look for @unabandonware.bsky.social's table with 20+ Japanese feature phones! Unabandonware is one of the foremost keitai game preservationists, and she'd love to tell you all about them!
January 8, 2026 at 5:10 PM
Are you at MAGFest? Want to try some preserved keitai games? You're in luck! Come to the Museum/LAN Room and look for @unabandonware.bsky.social's table with 20+ Japanese feature phones! Unabandonware is one of the foremost keitai game preservationists, and she'd love to tell you all about them!
Yeah, it can be run offline. It needs an internet connection to connect to the database, but it can play downloaded apps offline.
January 2, 2026 at 5:12 AM
Yeah, it can be run offline. It needs an internet connection to connect to the database, but it can play downloaded apps offline.
2025 has been an incredible year for keitai game preservation! Your continued support for this small part of gaming history has meant the world to me, so thank you! Here are some year-end preservation statistics from Keitai World Launcher. Here's to an amazing 2026!
December 31, 2025 at 8:54 PM
2025 has been an incredible year for keitai game preservation! Your continued support for this small part of gaming history has meant the world to me, so thank you! Here are some year-end preservation statistics from Keitai World Launcher. Here's to an amazing 2026!
Keitai World Launcher now includes the Free-J2MEPlus emulator, which supports EZplus Java games! You can play preserved EZweb games like #Tetris Outdoor, which features Linda from Stretch Panic... an unexpected crossover! KWL will have more EZweb game integrations in the future.
December 29, 2025 at 9:02 PM
Keitai World Launcher now includes the Free-J2MEPlus emulator, which supports EZplus Java games! You can play preserved EZweb games like #Tetris Outdoor, which features Linda from Stretch Panic... an unexpected crossover! KWL will have more EZweb game integrations in the future.
You can watch
@frigamarrymepls
's longer gameplay here: youtu.be/5ZR3dVh-J6s?...
There are still some crashes, and the opening cutscenes don't play properly for some reason, but it's overall a success! Bruteforcing SD card data takes some time, but the results are worth it.
@frigamarrymepls
's longer gameplay here: youtu.be/5ZR3dVh-J6s?...
There are still some crashes, and the opening cutscenes don't play properly for some reason, but it's overall a success! Bruteforcing SD card data takes some time, but the results are worth it.
Professor Layton and the Curious Village - DoCoMo i-appli Purchased Demo Gameplay
YouTube video by Penguinstrain
youtu.be
December 26, 2025 at 10:07 PM
You can watch
@frigamarrymepls
's longer gameplay here: youtu.be/5ZR3dVh-J6s?...
There are still some crashes, and the opening cutscenes don't play properly for some reason, but it's overall a success! Bruteforcing SD card data takes some time, but the results are worth it.
@frigamarrymepls
's longer gameplay here: youtu.be/5ZR3dVh-J6s?...
There are still some crashes, and the opening cutscenes don't play properly for some reason, but it's overall a success! Bruteforcing SD card data takes some time, but the results are worth it.
After some SD card bruteforcing, the downloaded i-mode trial of Professor Layton and the Curious Village was preserved by @unabandonware.bsky.social and @yuvi.app ! Unlike the preloaded i-mode trial, this contains all of chapter 1 and is closer to the original DS game (voice acting, cutscenes).
December 26, 2025 at 10:07 PM
After some SD card bruteforcing, the downloaded i-mode trial of Professor Layton and the Curious Village was preserved by @unabandonware.bsky.social and @yuvi.app ! Unlike the preloaded i-mode trial, this contains all of chapter 1 and is closer to the original DS game (voice acting, cutscenes).