Sonic Adventure DX Mobile

Sonic Adventure DX Mobile is a mobile video game developed by Neofun Mobile Studios (with additional work by Sonic Team) and published by SEGA. It was released in 2008 for Harttech Mobile Platform, Portosic OS (now PTSUG) and ViraOS based mobile phones. It is a mobile port of the 1998 Dreamcast game Sonic Adventure, although it is based on the 2004 version of the game that was released under the name Sonic Adventure DX.

Gameplay

 * The mobile version can be controlled by either using the phone's keypad or the phone's touchscreen. The keypad controls are:
 * Move Character - D-Pad/2, 4, 6, 8
 * Spin Dash - 0
 * Jump/Jump Attack/Homing Attack - Confirm/5
 * Action - 1, 2
 * Pause - Right Soft Key
 * The Adventure Field areas (Station Square, Mystic Ruins and Egg Carrier), as well as the Chao Garden, are absent on older and low-end phones due to hardware limitations.
 * Because of this, the mobile version of the game, when played on an older or low-end phone, is rather played in a linear, traditional 3D platformer style.

Graphics

 * Most of the polygon count of the characters, objects and scenery are reduced in order to be optimized to run on mobile devices. The same thing also goes to the quality of the effects and textures, which they were also reduced as well.

Music/Sounds

 * On older and low-end phones (such as the Hartphone 5000, the TheoryPhone 4 and ViraPhone Advanced), most of the in-game background music in the mobile version are replaced with the their respective MIDI versions.
 * However, on newer and high-end phones (such as the Hartphone 7000, the Hartphone 8000, the TheoryPhone X2, and the ViraPhone i), the MP3 versions of the in-game background music are used instead.
 * All of the sound effects (include dialogue) are compressed at a lower sample rate.

User Interface

 * The user interface is modified in order to be optimized for smaller screens.

Harttech Mobile Platform

 * Hartphone 5000/Hartphone 5500
 * Hartphone 6000/Hartphone 6500
 * Hartphone 7000/Hartphone 7500
 * Hartphone 8000/Hartphone 8500
 * Hartphone 9000/Hartphone 9500

Portosic OS

 * TheoryPhone 4/TheoryPhone 4i
 * TheoryPhone X/TheoryPhone Xi
 * TheoryPhone X2
 * TheoryPhone X2i

ViraOS

 * ViraPhone Advanced
 * ViraPhone i
 * ViraPhone i2
 * ViraPhone i3

Critical reception
Sonic Adventure DX Mobile received mostly positive reviews upon its initial release. The game was praised by critics and reviewers, due to it being a technically ambitious port and it nearly translates the same console platformer experience to mobile devices. It was criticized due to its janky controls and performance issues.