Alex Kidd in Miracle World

Many centuries ago, on the planet Aries, there lived a boy called Alex Kidd. For seven years, he lived on Mt. Eternal studying Shellcore, an ancient art that makes one strong enough to break rocks into pieces. As he was leaving the mountain one day to travel to his spiritual homeland, a dying man told him that the peaceful city of Radactian was in grave danger. Before taking his last breath, the man gave Alex a piece of a map and a medallion made of Sun Stone.

Alex Kidd in Miracle World is a 2D platform game. Throughout the 17 stages, Alex faces many monsters and the three henchmen of Janken the Great, before facing Janken himself. Alex's punching ability is used to destroy enemies and to break rocks in order to access new paths and to collect items such as money which can then be used to purchase other items including vehicles such as motorbikes and helicopters.