Tested and working. All games complete except Sonic & Knuckles which is just the cart. Cases in great shape though Sonic 1 is missing the hangtab. Sonic 3 manual has the front and back of cover separated.

Sonic the Hedgehog
Sonic the Hedgehog 2
Sonic the Hedgehog 3
Sonic the Hedgehog Spinball
Sonic & Knuckles