Restore Lyrics Japanese Songs HQ - Replaces the instrumental Opening and Ending songs used by the Japanese soundtrack with the versions with vocals, as found on the original Japanese and European Mega CD releases.Also fixes the speed of the Ending version of Sonic Boom from the US soundtrack. Sonic CD original 4:3 videos - Replaces the stretched 16:9 videos with the original 4:3 versions, pillarboxed to 16:9.The load order priority for mods in the Steam version is top to bottom, whereas the decompilation port's load order priority is bottom to top. An open-source decompilation port of Sonic CD (2012) developed by Rubberduckycooly and other contributors was released in 2021, featuring various improvements and a built-in mod loader similarly to the mobile decompilation ports of Sonic the Hedgehog and Sonic the Hedgehog 2. A mod loader for the Steam version of the game was released in 2017, allowing for modifications to be possible. Despite featuring multiple resolution scaling options, the game has a persistent smoothing effect, making it impossible to provide a sharp pixel image quality. The game physics and speed in Sonic CD (2012) are tied around 60 FPS, meaning slowdowns on lower end machines and speedups with high refresh rate monitors. This game was delisted on Steam on May 2022 but it has been re-released as part of Sonic Origins. The success of the 2012 Retro Engine remaster of Sonic CD lead Christian Whitehead to continue working with Sega and a collaboration with Headcannon to develop similar remasters for Sonic the Hedgehog and Sonic the Hedgehog 2 for Android and iOS devices in 2013, both of whom also went on to collaborate with PagodaWest Games to develop Sonic Mania in 2017. The Retro Engine remaster is notable in that it is not a direct port of the Sega CD version nor emulation, but rather rebuilt from scratch using the engine which allows for an array of enhancements such as native widescreen presentation, 60 FPS Special Stages, higher quality FMV cutscenes, the ability to use the Spin Dash mechanics from Sonic CD or Sonic the Hedgehog 2, and includes both the Japanese and North American soundtracks. It was later ported to Windows through Steam in 2012. The Retro Engine remaster of Sonic CD was originally developed for Xbox 360, PlayStation 3, Android and iOS devices in 2011. It is enhanced remastered version of Sonic CD that uses the Retro Engine developed by Christian Whitehead. Sonic CD (2012) is a cartoon side view platform game developed by Sonic Team and published by Sega.

Sonic 1 extended sprites