Door Door

Door Door is a 1983 single-screen platform video game developed and published by Enix in Japan. Originally released for the NEC PC-8801, it was ported to a number of other platforms, including the Family Computer. Controlling a small character named Chun, the player is tasked with completing each stage by trapping different kinds of aliens behind sliding doors. Chun can jump over the aliens and climb ladders, and must also avoid obstacles such as large nails and bombs.

Door Door was designed by Koichi Nakamura, known as one of the creators of Dragon Quest. The game was the runner-up in the Enix-sponsored "First Game and Hobby Program Contest" in 1982, winning the Outstanding Program Award with a prize of 500,000 yen. Enix was given the rights to the game and ported it to several Japanese home computers. Chun, the name of the protagonist, was a nickname given to Nakamura by one of his friends.