Choose Sliver from the Episode selection menu. Note: This works best if you have completed Sliver's mode. Move to the part of the pier from where as Tails or Sonic you travel to Wave Ocean. Next to the building is a barrel with no cover. If desired, go inside. This makes it easier to get Blaze in. After a couple attempts of spinning in circles, Blaze should come in. If you are near the edge of the barrel, use Psychokinesis to see Silver's head pop out of the barrel. If you have plenty of patience, you can get Blaze to be in the barrel and Sliver on top after fooling around with it.