From the Super Mario Wiki
The GOAL! Ring, also called the goal roulette, is a ring found in Super Mario World 2: Yoshi's Island, Yoshi's Island: Super Mario Advance 3, Yoshi's Island DS, and Yoshi's New Island. It is found at the end of every level (except for Castles and Fortresses), acting as the goal point. The GOAL! Ring is a circle consisting of all the Smiley Flowers the player collected in that level and blue dots. When entered, the word "GOAL!" appears in the top-right corner of the screen.
When a Yoshi jumps through the GOAL! Ring and passes one of the babies to the next Yoshi, it will start spinning slower and slower. After a few seconds, the GOAL! Ring will stop spinning and land on either a blue dot or on a Smiley Flower. If it lands on a blue dot, nothing happens and the player continues to the scoreboard and then the next level. However, if the roulette stops on a flower, the player instantly goes to a Bonus Challenge (or gets five Medals, as in Yoshi's New Island) when it goes to the scoreboard. In Super Mario World 2: Yoshi's Island, Yoshi's Island: Super Mario Advance 3 and Yoshi's Island DS, after the instant Bonus Challenge, the player will go to the next level. If the player missed a Flower in the stage, the matching spot in the GOAL! Ring will not bloom; landing on one of these flower buds has the same result as landing on a blue dot.
Names in other languages
Gōru no Rūretto