ooo this is actually a good question... i've been meaning to play the 2d games for ages but i'm always too lazy to do it.... lately though i picked up sonic mania again cuz it turns out i had it on my switch account! i'm planning on playing the other 2d games [on emulator cause i am Very broke] after i finish the modern games i own... i think i might start with sonic advance cuz i've heard it's fun + I LOVE GBA GAMES! if i do play the genesis games i'll prolly do it in release order [1 -> 2 -> 3&K] !