Sonic 2: S3 Edition - Sonic Retro

This Infamous NES Sonic Hack Just Got A Serious Upgrade

List of Sonic the Hedgehog video games - Wikipedia

Sonic 2: S3 Edition (Genesis) - Longplay

Sonic 3 '14 Project [Sonic the Hedgehog 2 (2013)] [Mods]

The 10 Best Sonic Games - IGN

Sonic Origins cheat codes for level select, debug mode and Super Sonic

Sonic the Hedgehog CD (2011)

Review: Sonic Origins is a tragic example of good classics ruined by greed

Sonic 2: S3 Edition : MeeiMekhi : Free Download, Borrow, and Streaming : Internet Archive

Sonic Origins cheat codes for level select, debug mode and Super Sonic

Sonic 2 Styled Appearance: Definitive edition [Sonic 3 A.I.R.] [Mods]

Steam Workshop::Sonic Rom Hacks

S3 Sonic [Sonic The Hedgehog 2 Absolute] [Mods]

So apparently, there's a official Brazilian version of Sonic Unleashed with the modern PS3 label (which means it is one of only 3 versions of Sonic Unleashed with the modern PS3 label

Sonic 2 Absolute: Sonic 3 Edition ✪ First Look Gameplay (1080p/60fps)