Timed Jumps on Moving Bars
From the Super Mario Wiki
The player needs to climb the clock until they get to the pole with the Amp circling it. After climbing the pole, the player needs to take the moving lifts upward and jump across the platforms to the top of the mesh cage. At the end are three Moving Bars that come out of the wall. The player has to time their jumps with the timing of the Moving Bars to reach the Power Star in the cage.
In the DS version, the player must either use Luigi's invisible form to go into the cage or break the Black Brick with Wario. Additionally, there are only two moving bars in the remake instead of three.
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