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
Thanks to @aid1043.bsky.social and Penguinstrain, Columns Jewel has an English patch! This was a #Columns keitai game that was preserved last year. It has a story mode, where Sana travels back in time after wearing a mysterious bracelet. There's also a puzzle mode with 40 puzzles!
November 10, 2025 at 11:02 PM
Thanks to @aid1043.bsky.social and Penguinstrain, Columns Jewel has an English patch! This was a #Columns keitai game that was preserved last year. It has a story mode, where Sana travels back in time after wearing a mysterious bracelet. There's also a puzzle mode with 40 puzzles!
We've found plenty of keitai freeware games, but "Super Merio" has shown up on multiple devices. As the name suggests, it's a Mario clone. Released in 2001, it's one of the earliest pieces of keitai freeware that we've preserved. It has two sequels (?) and even a spinoff called "Dr. Merio."
November 4, 2025 at 12:31 AM
We've found plenty of keitai freeware games, but "Super Merio" has shown up on multiple devices. As the name suggests, it's a Mario clone. Released in 2001, it's one of the earliest pieces of keitai freeware that we've preserved. It has two sequels (?) and even a spinoff called "Dr. Merio."
Gameplay of THE Skydiving, a keitai game released in 2009. This was preserved by LNRC earlier this month. You try to skydive to the ground as fast as possible, dodging missiles and passing through fellow skydivers in the process!
October 29, 2025 at 11:57 PM
Gameplay of THE Skydiving, a keitai game released in 2009. This was preserved by LNRC earlier this month. You try to skydive to the ground as fast as possible, dodging missiles and passing through fellow skydivers in the process!
Cuebus preserved DoDonPuchi Zero (ドドンプチ零) and a trial version of DoDonPuchi (ドドンプチ)! Released in 2003, DoDonPuchi Zero was CAVE's first original shooter for keitai. Both were lost to time until now! DoDonPuchi Zero's soundtrack was composed by Namiki Manabu.
October 27, 2025 at 10:09 PM
Cuebus preserved DoDonPuchi Zero (ドドンプチ零) and a trial version of DoDonPuchi (ドドンプチ)! Released in 2003, DoDonPuchi Zero was CAVE's first original shooter for keitai. Both were lost to time until now! DoDonPuchi Zero's soundtrack was composed by Namiki Manabu.
Biohazard: The Episodes was preserved by @yuvi.app! Lost to time until today, this mission-based game was based on Biohazard 3. It appears to be the full game, minus extra characters. We have now preserved at least partial copies of all three keitai-exclusive 3D #Biohazard games!
October 17, 2025 at 5:41 PM
Biohazard: The Episodes was preserved by @yuvi.app! Lost to time until today, this mission-based game was based on Biohazard 3. It appears to be the full game, minus extra characters. We have now preserved at least partial copies of all three keitai-exclusive 3D #Biohazard games!
ICYMI, after 7 months of work, @aid1043.bsky.social finished their English translation patch for all eight Kingdom Hearts Mobile keitai minigames! Preserved last year, this patch even contains recreations of cut content, like bonus puzzles and downloadable cards! (Video credit to Aid)
October 8, 2025 at 6:18 PM
ICYMI, after 7 months of work, @aid1043.bsky.social finished their English translation patch for all eight Kingdom Hearts Mobile keitai minigames! Preserved last year, this patch even contains recreations of cut content, like bonus puzzles and downloadable cards! (Video credit to Aid)
Reposted by RockmanCosmo
After 7 months of work, my latest project: a full English patch of Kingdom Hearts Mobile! You can play all 8 of these previously-lost mini-games, in English for the first time.
There's puzzle games, card games, rhythm games, and more, and even canon lore!
More info: youtu.be/dWJEfN3W6Iw
There's puzzle games, card games, rhythm games, and more, and even canon lore!
More info: youtu.be/dWJEfN3W6Iw
October 6, 2025 at 11:07 PM
After 7 months of work, my latest project: a full English patch of Kingdom Hearts Mobile! You can play all 8 of these previously-lost mini-games, in English for the first time.
There's puzzle games, card games, rhythm games, and more, and even canon lore!
More info: youtu.be/dWJEfN3W6Iw
There's puzzle games, card games, rhythm games, and more, and even canon lore!
More info: youtu.be/dWJEfN3W6Iw
Dokodemo Dodgeball Fantasia (どこでもドッジボ−ルファンタジア) was a dodgeball RPG released for keitai in 2006. Yes, you read that right! It's got a coming-of-age story and a real time battle system. We preserved this game earlier this year, and it's incredibly unique.
October 6, 2025 at 10:49 PM
Dokodemo Dodgeball Fantasia (どこでもドッジボ−ルファンタジア) was a dodgeball RPG released for keitai in 2006. Yes, you read that right! It's got a coming-of-age story and a real time battle system. We preserved this game earlier this year, and it's incredibly unique.
R.O.B. - Ride on the Beat!! was preserved by @yuvi.app! Released in 2005 for keitai, this is a 3D rhythm game where you ride a hoverboard and change lanes to the beat of the music. It's pretty fun! The 3D graphics are also quite good for a 2005 keitai game.
October 2, 2025 at 6:06 PM
R.O.B. - Ride on the Beat!! was preserved by @yuvi.app! Released in 2005 for keitai, this is a 3D rhythm game where you ride a hoverboard and change lanes to the beat of the music. It's pretty fun! The 3D graphics are also quite good for a 2005 keitai game.
Introducing @keitaiarchive.bsky.social, a website for Japanese feature phone game preservation resources. As keitai game preservation grows, we want our tools and preserved abandonware media to be as accessible as possible. Read on for more information! (1/6)
October 1, 2025 at 6:16 PM
Introducing @keitaiarchive.bsky.social, a website for Japanese feature phone game preservation resources. As keitai game preservation grows, we want our tools and preserved abandonware media to be as accessible as possible. Read on for more information! (1/6)
Cuebus and I preserved Konami Wai Wai Sōkoban (コナミワイワイ倉庫番), a keitai-exclusive #Konami puzzle game! It features characters from various Konami games. A year ago, I found the phone that this game originated on, but the screen was broken. Cuebus managed to dump it today.
September 26, 2025 at 6:33 PM
Cuebus and I preserved Konami Wai Wai Sōkoban (コナミワイワイ倉庫番), a keitai-exclusive #Konami puzzle game! It features characters from various Konami games. A year ago, I found the phone that this game originated on, but the screen was broken. Cuebus managed to dump it today.
Thanks to Cuebus's chipoff dump of the 911T, the trial version of Armored Core Mobile 3 has been preserved! This is the SoftBank Yahoo Keitai version. Preloaded on the 911T, #ArmoredCore Mobile 3's trial lets you play through a few missions.
(Video credit: @XLeonier)
(Video credit: @XLeonier)
September 23, 2025 at 4:11 PM
Thanks to Cuebus's chipoff dump of the 911T, the trial version of Armored Core Mobile 3 has been preserved! This is the SoftBank Yahoo Keitai version. Preloaded on the 911T, #ArmoredCore Mobile 3's trial lets you play through a few missions.
(Video credit: @XLeonier)
(Video credit: @XLeonier)
DoDonPachi DaiOuJou DX Reco.ver (大往生DX-ﾚｺver.-) was preserved by Yuuku! Only sold on December 30, 2007, this is a score competition variant of DoDonPachi DaiOuJou DX. Given how it was only available for one day, this may be one of the rarest i-mode games preserved so far.
September 10, 2025 at 5:23 PM
DoDonPachi DaiOuJou DX Reco.ver (大往生DX-ﾚｺver.-) was preserved by Yuuku! Only sold on December 30, 2007, this is a score competition variant of DoDonPachi DaiOuJou DX. Given how it was only available for one day, this may be one of the rarest i-mode games preserved so far.
The original i-mode release of #Bomberman 3D was preserved by @yuvi.app! Released in 2004, the game has fully 3D stages with multiple elevations. Its EZweb, Yahoo Keitai, and international J2ME releases have also been preserved to various extents.
September 1, 2025 at 5:33 PM
The original i-mode release of #Bomberman 3D was preserved by @yuvi.app! Released in 2004, the game has fully 3D stages with multiple elevations. Its EZweb, Yahoo Keitai, and international J2ME releases have also been preserved to various extents.
ICYMI, @yuvi.app partially preserved Biohazard: The Operations, a previously-lost Biohazard keitai game! It heavily relied on missing SD card data, but Yuvi painstakingly recreated the data from scratch, resulting in all missions and online leaderboards being functional! (1/2)
August 28, 2025 at 6:17 PM
ICYMI, @yuvi.app partially preserved Biohazard: The Operations, a previously-lost Biohazard keitai game! It heavily relied on missing SD card data, but Yuvi painstakingly recreated the data from scratch, resulting in all missions and online leaderboards being functional! (1/2)
Cuebus and @yuvi.app preserved Space Invaders x Pac Man! Available for only a month in 2005, this crossover game was exclusive to i-mode and lost to time until today! The Pac Man ghosts are replaced with Space Invader enemies, among other minor changes.
August 27, 2025 at 4:12 PM
Cuebus and @yuvi.app preserved Space Invaders x Pac Man! Available for only a month in 2005, this crossover game was exclusive to i-mode and lost to time until today! The Pac Man ghosts are replaced with Space Invader enemies, among other minor changes.
Reposted by RockmanCosmo
Biohazard: The Operations
Recovered from an F904i I recently acquired. I had to create a server and recreate the whole Spencer Mansion one scene at a time! The game is 95% complete!
We made a partial English patch thanks to @snowyaria.bsky.social, @shentok.com, and myself
youtu.be/hC1VyUFzqCA
Recovered from an F904i I recently acquired. I had to create a server and recreate the whole Spencer Mansion one scene at a time! The game is 95% complete!
We made a partial English patch thanks to @snowyaria.bsky.social, @shentok.com, and myself
youtu.be/hC1VyUFzqCA
Biohazard Operations - Recovered Keitai Game
YouTube video by YuviApp
youtu.be
August 26, 2025 at 7:45 PM
Biohazard: The Operations
Recovered from an F904i I recently acquired. I had to create a server and recreate the whole Spencer Mansion one scene at a time! The game is 95% complete!
We made a partial English patch thanks to @snowyaria.bsky.social, @shentok.com, and myself
youtu.be/hC1VyUFzqCA
Recovered from an F904i I recently acquired. I had to create a server and recreate the whole Spencer Mansion one scene at a time! The game is 95% complete!
We made a partial English patch thanks to @snowyaria.bsky.social, @shentok.com, and myself
youtu.be/hC1VyUFzqCA
Yuuku preserved Mushihimesama Gaiden (虫姫さま外伝), a keitai-exclusive spinoff of CAVE's #Mushihimesama series! You walk around and throw bombs at enemies, which is a departure from CAVE's usual bullet hell shooters.
August 25, 2025 at 5:02 PM
Yuuku preserved Mushihimesama Gaiden (虫姫さま外伝), a keitai-exclusive spinoff of CAVE's #Mushihimesama series! You walk around and throw bombs at enemies, which is a departure from CAVE's usual bullet hell shooters.
All four chapters of Corpse Party: NewChapter were preserved by Yuuku! Released from 2006 to 2007, it is a keitai-exclusive remake of the original PC-98 game. Despite being canceled before its fifth chapter, this previously-lost game served as a base for future #CorpseParty ports.
August 22, 2025 at 5:29 PM
All four chapters of Corpse Party: NewChapter were preserved by Yuuku! Released from 2006 to 2007, it is a keitai-exclusive remake of the original PC-98 game. Despite being canceled before its fifth chapter, this previously-lost game served as a base for future #CorpseParty ports.
The i-mode version of Glory of Valkyrie (ワルキューレの栄光) was preserved by Yuuku! Its Android port had been preserved, but its original keitai release had been lost until today! Earlier this year, we also preserved its keitai-exclusive sequel, The Glory of Valkyrie 2.
August 21, 2025 at 7:38 PM
The i-mode version of Glory of Valkyrie (ワルキューレの栄光) was preserved by Yuuku! Its Android port had been preserved, but its original keitai release had been lost until today! Earlier this year, we also preserved its keitai-exclusive sequel, The Glory of Valkyrie 2.
This is Wild Land, a keitai game made for the F-04B, a device that can split in two. Utilizing Wii-like motion controls, it's a keitai game like no other! While it was preserved last year, its motion controls can't be properly emulated yet.
August 19, 2025 at 8:38 PM
This is Wild Land, a keitai game made for the F-04B, a device that can split in two. Utilizing Wii-like motion controls, it's a keitai game like no other! While it was preserved last year, its motion controls can't be properly emulated yet.
The first chapter of Edotan (えどたん) was preserved by 2Soulz! Originally released on keitai before being ported to smartphones, Edotan is a detective visual novel by #Capcom. It takes many elements from #AceAttorney. Edotan received a keitai-exclusive sequel, which remains lost to time.
August 15, 2025 at 8:27 PM
The first chapter of Edotan (えどたん) was preserved by 2Soulz! Originally released on keitai before being ported to smartphones, Edotan is a detective visual novel by #Capcom. It takes many elements from #AceAttorney. Edotan received a keitai-exclusive sequel, which remains lost to time.
Chase H.Q. 3D was partially preserved by @yuvi.app last year! Originally released for keitai in 2005, this was a 3D conversion of the original #Taito arcade game. Our i-mode copy is Episode 0, and we also have a trial of the Yahoo Keitai version. The full game still remains lost.
August 14, 2025 at 7:10 PM
Did you know that Elevator Action received two FPS games on keitai? Released in 2005, Elevator Action Real was a 3D conversion of the original arcade game. Its sequel, Elevator Action Real 2, has you play as a ghost hunter! Both games remain lost to time. Longer gameplays below!
August 11, 2025 at 7:35 PM
Did you know that Elevator Action received two FPS games on keitai? Released in 2005, Elevator Action Real was a 3D conversion of the original arcade game. Its sequel, Elevator Action Real 2, has you play as a ghost hunter! Both games remain lost to time. Longer gameplays below!
Last year, the trial version of DoDonPachi's i-mode port was preserved. It includes the first stage. The game runs surprisingly well for the hardware it was released on! The DoJa 5.1 SDK has performance issues when multiple sounds play at once, so my gameplay has SFX turned off.
August 7, 2025 at 7:07 PM
Last year, the trial version of DoDonPachi's i-mode port was preserved. It includes the first stage. The game runs surprisingly well for the hardware it was released on! The DoJa 5.1 SDK has performance issues when multiple sounds play at once, so my gameplay has SFX turned off.