Legitimate Nintendo DS ROMs always end in the .nds file extension. If a website forces you to download an .exe file to play the game, cancel the download immediately, as it is likely malware.

Sonic Unleashed eventually landed on four major platforms: the Xbox 360, PlayStation 3, Nintendo Wii, and PlayStation 2. However, a massive corner of the gaming market at the time was left out—the Nintendo DS. Over the years, the search term has become a legendary white whale in the emulation community.

A mobile version of Sonic Unleashed was released for Java-based phones. Some players use DS homebrew to emulate this version. Often, these files are actually Sonic Colors (DS) or Sonic Rush , which feature similar "boost" gameplay mechanics.