These are carts that plugged into the Sega Megaplay and megatech arcade boards, much like the Nintendo playchoice 10. I have next to no info currently.
Sonic 1 sitting on a Sega Megaplay board.
Sonic 2 Megatech Cart.
Sonic Megaplay cart and extras.
Screenshots of The Megatech unit running Sonic 2
Part 1 - Part 2
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