Play as Knuckles and climbs the walls, and every once in a while jump on one of the bricks. Watch out for his ball of spines.

Hope it works,

Drainager

More air in water use sonic first then cream then go to act 2 go forward till you crash into a wall next to a spring hop on the spring then go forward again then get the shoe in the capsoul then go in the water! Then there will be a bubble around sonic then sonic will have a bubble like in sonic 1 to or 2 or 3!

To unlock cream go to stage 7 act three and complete it using sonic and tails

To unlock Knuckels, Cream and Amy beat the second zone third act with sonic your leader. Then beat fourth zone third act with sonic your leader. Then beat sixth zone third act with sonic your leader.