Jump off a building machine is a large amusement park and theme park common mobile games. Mainland have many call, such as through the roller, vertical limit, heaven and earth pair jump off a building machine (especially the twin towers), Taiwan is affected by the leofoo village, usually referred to as "the wrath of god". This kind of amusement equipment in Taiwan to load to high altitude, the passengers and acceleration of gravity almost vertical drop down, finally to machinery will be in before the fall to the ground, the use of free fall in the physics design of amusement equipment, also named after free fall for.