Here are some cards from Cookie Crisp Cereal.
As you can see in the photos, the images are change-able, depending on the viewing angle. This is called lenticular, but no one ever remembers that. Each card has 3 images inside. The first one will show Tails standing and then running as an alternate image, and the second may be a spin-attacking Sonic and something else. (thanks to Juni for the changing info) The backs have profiles that are the same as the plush dolls from this era. The "Game Tips" are not actually tips at all, but rather descriptions of why Sonic 2 is so good.