first i was looking forward for aquarium park on sonic generations because its my favourite level and i love the yellow free swimming torpedo form also laser and BINGO Highway from sonic heroes, instead there was planet wisp (the pink wisp is so dodgy to control and a bit glitchy ) and seaside hill as tricky - intense wall jump areas, so if anyone vote for 3 levels:

Aquarium park

Bingo highway or
EITHER

Angel island

thank you