Secret Course 12
From the Super Mario Wiki
The course starts with a Pause Block and six Fuzzies moving in a circle. The first three Bonus Medals are in the center of these Fuzzies. Next are two Fuzzies moving quickly up and down as well as the fourth Bonus Medal, which is above the second Fuzzy. After that is another Pause Block, a Springboard, and three more Fuzzies moving in a circle right before the Goal Pole. The fifth and final Bonus Medal can be obtained by jumping off the Springboard.