Head to the right and use a Rainbow Rope to remove the bluish clay to find a button. The exit door will rise out of the ground. Head on in and you'll be transformed into a tank! Time for a quick tank ...

Want to start off with a few extra Point Stars? Roll to the left and clear the bluish-green gunk with a Rainbow Rope to find a button. Dash into the button and a few extra Point Stars will appear. Yay ...