Sonic Adventure DX Director's Cut Tips

Rings out of stages
To get some rings out of stages, follow these steps

Sonic: go to the hotel and press the switch for the rings to appear. Use light dash. Same thing for entrance to Casinopolis

Tails: cutting grass around your workshop using Rythemn Badge will produce rings

Knuckles: Digging in the grassy areas in Station Squares gives you rings.

Big: Casting your line in the watersa oth the sewers gives you rings.