You have 30 seconds on the clock so you need to move. Race to the left and grab a Green +Clock then dash right to another. Take the clear pipe to another Green +Clock then down over the roller and through the clear pipe at the bottom for two more. Head under the far platform for a 1-Up Mushroom then left to a Green +Clock . Touch the Green Star Ring and quickly grab all the coins for Green Star #1 .
Leap up to another Green +Clock and if you’re crafty, jump between the rollers in the back to a second Green +Clock before entering the pipe. Underground, slide down and take the top route to a Green +Clock near some Skipsqueaks.
Jump up from the Cloud Platform to find Green Star #2 then ground pound through the Cloud Platform to a pipe. Light all the Colored Panels as quick as you can; the POW Block and ground pounds should help out a lot. Snag the two Green +Clocks and Green Star #3 then go back through the pipe.
Drop down between the rollers for a Green +Clock then into the pipe. At left is another Green +Clock , right is the pipe to the Goal Pole. If you’ve been precise in grabbing extra time throughout the level then you should have plenty of time to run up the rollers to cap the Goal Pole, but if you’re short on time just make it to the end.