Time hole

A Time Hole is a magical hole in Mario & Luigi: Partners In Time. When someone steps on the Time Hole he will go to the past or present.

It first appeared after Mario defeated the Junior Shrooboid. The Time Machine that E. Gadd built made a Time Hole appear outside of Peach's Castle. Mario, Luigi and E. Gadd went to look at it, but then Toadsworth came running in pushing Luigi in the Time Hole. Mario had no choice but to jump in with Luigi.