I honestly adore this game replaying it. There's so much to love about this game in my opinion. I think the concept of time travel feels perfect for a Classic Sonic title, and the levels do this very well. The level design is very beautiful; bright eye catching colours in the good futures, dark atmospheres with the bad futures, dull old looking worlds in the past, and a base to go off of in the present. The music is also just amazing, I played with the Japanese soundtrack and there are so many songs that I can choose for a favourite, from the cheerful Palmtree Panic Good Future, to the iconic Stardust Speedway Bad Future, or even Wacky Workbench Past, there's so much to love. My only complaint about this game is all of the stuff they expect you to do. There's no way I'd enjoy this game if I went for every Metal Sonic hologram, every Robot Generator, and every Time Stone. I typically go for the Robot Generators until I have all the Time Stones, but getting the latter is such a hassle with how frustrating the special stages are that I'd rather break the generators. Even so, I love the exploration in this game. I'd like to revisit it and see what futures I'll get just by thinking less and speeding through the levels. Overall, it's a charming game and I really enjoy playing it again.