Is there any way you can enter the area where you activate the "?" switch again? (you have to look in the sun in the castle main hall to get there). I know there's a star there that you can get by picking up the red coins, but I didn't do it and now I'm wondering whether I'll be able to get that star at all......
You can re-enter that area as many times as you like even after activating the switch. Edit: Just look up, it'll let you in even though the light has disappeared.
