Liberado [ntsc][pal][iso]: Sonic

The standard for North America and Japan. The game runs at full speed (60 frames per second).

In the context of Sonic CD, the choice between NTSC and PAL is more than just region; it affects the game's core performance: Sonic liberado [NTSC][PAL][ISO]

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 North America and Japan

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. The standard for Europe and Australia

These are typically shared as ISO files, which can be burned to CD-R for play on a Model 1 or Model 2 Sega CD, both of which have virtually no piracy protection. Regional Differences [NTSC] vs. [PAL]

Sega CD (Mega-CD), and modern emulators like Kega Fusion or RetroArch.