Sega Forever Is a sub copany of SEGA where they put old games (form Genesis and Dreancast) into mobile

But there's 2 versions

Free: the game with ads

Premium:the game without ads

The only game that doesn't annoy you with ads is

Crazy Taxi

And all SEGA forever games might have golden outlines in their games icon

But weirdly enough

Sonic 4 ep:2 has the golden outline and free with ads treatment.

Not even ep:1

And sonic 4 isn't even a classic.

Btw to not get the ads you might want to pay a dollar or 2