Super Mario Galaxy 2/Beat Block Galaxy

Step to the Beep
In this star, make your way to the Block Pyramid and collect 5 silver stars. Like the star's name said, step to the beep. Then, once you get to the pyramid, get the silver stars and the Power Star will be at the top.

Silver Stars in Double Time
This is exactly the same the Step to the Beep, except that everything is four times faster than usual. Follow the instructions on Step to the Beep, but remember it's going faster than usual.