Instructions
Pass the first five levels. You should have at least eight stars to get the metal cap.
Find the watery area in the basement and look for the ledge door.
Do a long jump across to pass the gap within the course. You should also go past the boulders and look for the elevator.
Bend over the big monster by performing the ground pound [A+Z keys] after swimming though the lake.
Run over the monster's head.
Go to the ledge door and fall in a black thing. It will turn you into a Metal Mario.
Run over the bad guys and look for the switch at the end of the tunnel.
Activate the green cap by pressing the switch.