The crossing gate in Doraemon, formerly known as "initial random gate", is one of the most commonly used and important props in comics.

Initial random door (Japanese: initial random door), also known as steam random door, strange door and wishful door, is a prop displayed in Nobita's future world secret prop museum of the Japanese animation Doraemon. The producer is Dr. Hartman.

The appearance is very huge, with pink doorframes, and other different models of "Daxiong's Secret Prop Pavilion" and "Da Mo Yu". Random door is also one of the most commonly used props in Doraemon. Random gates are very useful in movies.