These are the Sonic games that are unavailable, even though unofficial means.
- Sonic the Hedgehog Level Creator (Flash) – No backups of this flash game.
- Sega Slots – Required Servers Offline
- Sega Heroes – Required Servers Offline
- Sega Streaming Theater Sonic Edition – Only available to select Japanese streamers.
Arcade
These arcade games are more like group experiences, utilising multiple screens and very custom setups. Even if the ROMs can be obtained, emulating them is not realistic.
Motorola Mobile Games
A bunch of old black and white mobile games for the old Motorola i3000 Plus. The only information we have is from announcements of these games, Sonic Logic doesn’t even have a single screenshot.
Sonic Cafe
In Japan, Sega had a service for Java games called Sonic Cafe on i-mode phones (a type of mobile internet service in Japan). A few of these games ended up being released in different regions (such as Brazil), but most remained exclusive in Japan. A YouTube account has footage of a bunch of these games, but they have not been backed up.
- Sonic the Hedgehog (2001 Sonic Cafe)
- Sonic Golf
- Speed
- Sonic Billiards
- Good Friend Chao
- Sonic Bowling
- Eggman’s Number Guess Panic!
- Sonic’s Mine Sweeper
- Sonic Racing Shift-Up
- Sonic Putter
- Sonic Reversi
- Tails Fly & Get
- Sonic Hopping 2
- Sonic Hearts
- Sonic Panel Puzzle
- Sonic Gammon
- Sonic Millionaire
- Sonic Reversi Hyper
- Amy’s American Page One
- Sonic Kart 3DX
- Sonic’s Sevens
- Sonic Golf 3D
- Sonic’s Napoleon
- Sonic’s Timed Train
- Sonic’s Casino Poker
Other Java Mobile Games
These are games that were released on other mobile services in Japan
LCD Games
LCD games requite a bit more effort to backup, as you can’t just copy a file, they’re more programmed for their specific units. That said, a few have been backed up, including most of the Sonic LED games from McDonald’s.
- SegaSonic the Hedgehog
- Sonic Spinball
- Sonic the Hedgehog 3
- Amazing Sonic
- Sonic Blast
- Sonic (Keychain)
- Sonic R
- Sonic Underground
- Sonic Adventure
- Amy & Rogue Volleyball
- Shadow Hockey
- Shadow Basketball
Backed up but not playable
- Sonic X (Leapster) – The .swf files have been extracted, but currently don’t work.
- Sonic The Hedghehog (Leapfrog Didj) – A ROM exists, but there is no emulator.