[ntsc][pal][iso] — Sonic Liberado

A popular variant of "liberado" ISOs allows players to enjoy the Japanese/European soundtrack while playing the English-localized (NTSC-U) version of the game.

The standard for Europe and Australia. Due to the slower refresh rate, PAL versions of Sonic CD originally ran approximately 17.5% slower than their NTSC counterparts. Sonic liberado [NTSC][PAL][ISO]

Sega CD (Mega-CD), and modern emulators like Kega Fusion or RetroArch. A popular variant of "liberado" ISOs allows players

For a modern experience without needing ISO patches, you might consider Sonic Origins or the Sonic CD Decompilation project, both of which offer widescreen support and selectable soundtracks by default. Sonic liberado [NTSC][PAL][ISO]