These special stages are so much fun! I love the NiGHTS special stages, but they tend to get really easy once you know what you're doing. These are just the right amount of challenge, and that seventh emerald certainly gives you a rough one! The aesthetic is so good too, really makes SRB2 feel even more like a classic Sonic game, especially when you pair it with CloneFighter's Classic Specials addon!
If I had to give ANY criticism at all, I would just say that the background colors don't match the SRB2 emerald order (Green, Purple, Blue, Cyan, etc.) and instead match the Advance order. Not really a problem, but it is kinda funny when you get the green emerald after beating the red special stage.
Other than that, this addon is PEAK. Love seeing addons that alter special stages.