Secret Switch #1

Provoke BoomerangGrunt to attack you. After that, when his stamina will regenerate, break cupcake and get back. Provoke him once again, wait about a second and press Secret Switch.

Go through bridge will appear and collect two coinz. After that stand in front of first arrow. Wait three seconds ( that is easy, because toggling bridge to the south is toggling second by second - just listen it carefully ) and step into the arrow. Hole could fill in itself for nearly one second. Do the same thing with second time and jump into blue wormhole!