[3] 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.

[5] The player's objective is to trap the aliens behind sliding doors positioned throughout each level, courses composed of platforms conjoined by assorted ladders.

When the player dies (provided they have continues) they restart the level with previously trapped aliens vanished, and all doors are accessible again.

Points are awarded for trapping aliens behind doors (with extra points going to players who corral multiple aliens behind one door) and collecting confectionery that intermittently appear and disappear on the playing screen, which include a striped piece of candy, an ice pop, a lollipop, a bowl of ice cream, a slice of cake, and a Mahjong tile.

Inspired by the popularity of personal computers in the United States, Yasuhiro Fukushima decided to set up Enix, going into the PC game business market, in 1982.

[citation needed] Fukushima wasn't a programmer himself, and Enix, in a broad sense, was simply intended to be a publishing company.

[6] To pool the talent of individual game designers, Enix sponsored a national programming contest.

[citation needed] Enix published the game on a wide range of Japanese computers, including NEC's PC-8801, Fujitsu's FM-7, and Sharp's MZ-2000.

In 1986, Enix's third Famicom production and first role-playing video game made Horii and Nakamura household names in Japan: Dragon Quest.

A faithful reproduction of the Famicom version, the application is available for the NTT DoCoMo FOMA 505i and 900i series phones, and can be downloaded from i-chunsoft for ¥300 per month.