Some upgrades from SA1, some downgrades.

The flow of the game improves from removing hub worlds which I like, but merging the character styles into just the Good/Evil stories means you cant JUST play as the character you want and because Sonic/Shadow's levels are much shorter than everyone else's, it feels like theres less Sonic gameplay than ever.

Treasure hunting levels are too big this time that it becomes a bit tedious, but the mech levels are great fun, as are the speedster levels.

Story is a classic aswell.