I feel like Knuckles not being in Sonic CD is a weirdly missed opportunity. The game's main focus is on something Knuckles' gameplay excels at - namely exploration - and it feels a bit weird that they wouldn't take advantage of that.
To be honest, Knuckles' gameplay has so much potential in so many forms. Like, with a few changes, I wouldn't mind a game similar to the treasure-hunting sections from the Adventure series but with modern technology and effective tweaks. I can imagine it actually being really fun - using various different abilities and the like and seeing older Sonic zones interpreted in 3D would be awesome, and HD Pumpkin Hill would be awesome too. I mean, it'll never happen (mostly because of the existence of Chaotix) but it'd still be very, very cool.
To be honest, Knuckles' gameplay has so much potential in so many forms. Like, with a few changes, I wouldn't mind a game similar to the treasure-hunting sections from the Adventure series but with modern technology and effective tweaks. I can imagine it actually being really fun - using various different abilities and the like and seeing older Sonic zones interpreted in 3D would be awesome, and HD Pumpkin Hill would be awesome too. I mean, it'll never happen (mostly because of the existence of Chaotix) but it'd still be very, very cool.