Sonic The Hedgehog x10 is a fan-made ROM hack likely featuring a modified gameplay experience of the original Sonic the Hedgehog. The 'x10' might indicate a tenfold increase in speed, difficulty, or some other gameplay aspect, although this is speculation without further details. Core gameplay might remain similar to the original, but the 'x10' modifier implies significant alterations.  It is a fan-made creation and is not officially affiliated with SEGA.

Sonic The Hedgehog x10

Sonic the Hedgehog Remix