I recommend Sonic 1 and Sonic 2. Here are some screenshots of me playing as Tails, the fox in Sonic 2.
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And 1 screenshot of me playing as Tails and Sonic is like when you are playing as Sonic but Tails follows you and my screenshot was when I got destroyed and game over was on my screen. When you get destroyed playing as Tails and Sonic, Sonic gets destroyed but Tails doesn’t but you can’t play as Tails so on my screen Tails was flying by the game over on my screen. This was on Sonic 1.