You collected all seven Chaos Emeralds.
You got a blue gumball.
You finished the game.
You completed the Icecap Zone.
You finished the Marble Garden Zone.
You scored 80,000 points.
You scored 40,000 points.
You finished the Hydrocity Zone.
You collected a Chaos Emerald.
You ran across water.
You scored 20,000 points.
You collected 50 rings.