Sega announced that Sonic 1, Sonic 2, Sonic 3 and Knuckles, and Sonic CD will be delisted from digital storefronts in May in the lead up to the remastered Sonic Origins collection.
The only good Sonic games : r/SonicTheHedgehog
Sega is Delisting The Classic Sonic Games Ahead of Sonic Origins Release - GamerBraves
New Sonic Game in the Works as SEGA Files for a Trademark - EssentiallySports, sonic game
Sega delisting classic Sonic games in May ahead of Sonic Origins, sonic game
PlayStation 4, Sonic Wiki Zone
Sega delisting classic Sonic games in May ahead of Sonic Origins, sonic game
Sonic Games Are Being Delisted Ahead Of Sonic Origins Release - IGN
Sega delists classic Sonic games ahead of Sonic Origins launch
Sega Is Delisting Classic Sonic Games From Digital Stores Ahead Of Sonic Origins' Launch - Game Informer
The Untold Truth Of Sonic The Hedgehog
Sega will delist digital versions of classic Sonic games on May 20th