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Sonic the Hedgehog Mobile

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Title Screen

Sonic the Hedgehog Mobile

Also known as: Sonic the Hedgehog Part 1, Sonic the Hedgehog Part 2 (IFone; US/EU), Sonic the Hedgehog (JP), 音速小子(上), 音速小子(下)(CN)
Developers: Sonic Team (I-Mode), iFone (US/EU J2ME Port)
Publishers: Sega (JP), Sega Mobile (US/EU), China Mobile Games, BMIT (CN)
Platforms: I-Mode (JP), J2ME (US/EU)
Released in JP: December 5, 2005 (Sonic Cafe)
Released in US: December 20, 2005
Released in EU: February 14, 2006
Released in CN: 2006

CodeIcon.png This game has unused code.
GraphicsIcon.png This game has unused graphics.
DebugIcon.png This game has debugging material.
LevelSelectIcon.png This game has a hidden level select.
RegionIcon.png This game has regional differences.
Carts.png This game has revisional differences.

So very stubbly.
This page is rather stubbly and could use some expansion.
Are you a bad enough dude to rescue this article?

Sonic 1 on a mobile phone before the iPhone port. Originally released through the Japan-only Sonic Cafe service (for I-Mode devices) and later given an inferior port to J2ME which was then provided as one full game or in two parts depending on the carrier.

It seems this version served as the basis for the Game Boy Advance port, Sonic the Hedgehog Genesis, which is generally considered to be the worst port of Sonic 1.

To do:

Unused Graphics


This UFO was used in the Genesis original's prototype build in Marble Zone while the final build deleted the sprite. So why is it here...?

(Source: Sonic Retro)



Leftover graphics from the removed Special Stage remain in the data.

Cheat Menu

Cheat menu of Part 1. Cheat menu of Part 2 and the Japanese release.

At the title screen, press 2, 3, 0, 6, 9, 1 (23/06/91, the US/European release date of the original game) to unlock the cheat menu. The cheat code doesn't seem to function in the Chinese release.

  • INVINCIBILITY - Makes you invincible.
  • UNLOCK LEVELS (Part 1 only) - Allows you to play all of the levels from Part 1 and Part 2. This option doesn't exist in the Japanese release, as it wasn't released as two separate games in Japan.
  • AMPHIBIOUS (Part 2 and Japanese release only) - Makes it impossible to drown.
  • EMERALDS - Allows you to set the amount of Chaos Emeralds you have.
  • FPS - Shows the current number of frames-per-second in the upper-left corner of the screen.
  • COORDS - Shows Sonic's coordinates in the upper-right corner of the screen.
  • CAMERA - Lets Sonic move in all directions without falling. Use # to toggle it mid-level.


blkcol.blt is a piece of collision data, stored in its "raw" bitmap-like format, before it was converted to being stored in rows via an unused function.

Revisional Differences

There was a second release of the game for Verizon phones that strangely removed all of the sound effects.

(Source: Sonic Retro)