Several cyberspace stages in Sonic Frontiers appear to rehash level layouts from past games

pcinvasion.com:

One of the many, many points of contention among fans when it comes to Sonic Frontiers has to do with its cyberspace stages. Some of them reimagine past levels such as Green Hill and Chemical Plant, which many fans rightly see as redundant since the last decade has seen most Sonic installments doing the exact same thing. On the other hand, several fans stated that they would find the reuse of level themes acceptable as long as these stages boasted original layouts. Unfortunately for the latter group, it looks like the cyberspace stages in Sonic Frontiers copy not just past themes, but past level layouts as well.

It all started yesterday when footage of the Gamescom demo first dropped online. When analyzing footage of the first cyberspace stage, which uses Green Hill’s aesthetics, eagle-eyed fans noticed that its layout closely matches that of Windmill Isle Act 1, the tutorial stage of Sonic Unleashed. Note that this side-by-side comparison edits parts of the Frontiers footage to make it sync up better with the Unleashed clip.

Then more footage of the cyberspace levels dropped today, and fans found yet more conspicuous instances of reused level layouts. Another Green Hill cyberspace level plays out almost exactly like Modern Sonic’s Green Hill stage from Sonic Generations, albeit with certain portions cut and the giant Chopper nowhere to be found. In a similar vein, one of the Chemical Plant cyberspace stages borrows much of the layout from Generations’ modern rendition of the same level. Retrospective analysis of yesterday’s Sky Sanctuary cyberspace stage even reveals bits of level design from Unleashed‘s Windmill Isle Act 2. So far, the only original cyberspace stage we have seen is this city one.

it's the exact same