Super Mario 64 DS Tips

Yellow Coins in a Red Coin Puzzle
This only happens once. Go to Lethal Lava Land and go to the red coin puzzle.
go on the solid tile where the star appears, wait for the puzzle to finish and BINGO! Yellow coins appear on the puzzle! Don't be afraid to collect them because the puzzle will stop until they are gone.

Please note that this happens once every time you go to that course and that it doesn't work anywhere else.