Sonic The Hedgehog 2 -europe Brazil- -en- -rev 1- Patched

This specific "piece" refers to a specific ROM file or version of Sonic The Hedgehog 2 Sega Master System (the 8-bit versions), which was notably popular in Europe and Brazil

You might wonder: Why track down a slower PAL ROM when I can just play the US version? Sonic The Hedgehog 2 -Europe Brazil- -En- -Rev 1-

For speedrunners and purists, US Rev 0 or Rev 1 is preferred. For PAL collectors, the Europe/Brazil Rev 1 is the definitive “fixed” PAL version. This specific "piece" refers to a specific ROM