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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.

There are eleven locations in which Alex must explore, each of them has its own unique dangers. In each location, Alex can collect bags of coins, which can be used to buy items at the shop and are used to help Alex get through each location (eg: motorcycle, peticopter, power bracelet, etc.) There are also traps that Alex must avoid like the ghost that chases him. He can also collect the Telepathy Ball that will help him read people's minds.

Later, Alex learns that in order to save Radactian from destruction, he must first defeat Janken the Great, Emperor of the planet Janbarik (he got his name from his expertise at the game of Janken -- or what people call "scissors, paper, stone" in the Western World. Janken has sent his henceman all over Radactian to prepare the game for Alex as he passes by them. In order to get past them, Alex must win three times at Janken. If he loses, he is turned to stone and vanished from Radactian forever. Later on in the game, Alex must play with the same henceman, but only this time, when Alex wins, they decide to play dirty.

Alex uses his fists to wipe out some of Janken's enemies such as birds, sea horses, bats, monkeys, frogs, and a few others. If his quest to save Radactian from the evil hands of Janken becomes difficult, he can instead use the power bracelet to perform the "Shocking Waves of Destruction", an ancient trick in the art of Shellcore.

Before Alex comes face-to-face with Janken, he should rescue his brother, Egle, from imprisonment, and get the letter and two medallions.


Alex Kidd in Miracle World SEGA Master System Alex Kidd breaks blocks with powerful punches.
Alex Kidd in Miracle World SEGA Master System While Alex is enjoying his favorite rice ball, we are presented with a map of Radactian
Alex Kidd in Miracle World SEGA Master System Watch out for the lightning bolt
Alex Kidd in Miracle World SEGA Master System Alex going inside Janken's castle

Promo Images

Alex Kidd in Miracle World Screenshot
Alex Kidd in Miracle World Screenshot

Alternate Titles

  • "アレックスキッドのミラクルワールド" -- Japanese spelling

Part of the Following Groups

User Reviews

A real classic for Master System. SEGA Master System Mumm-Ra (410)
Sega's rival to Mario in the action platform category SEGA Master System gametrader (233)
Difficult but one of the finest platformers ever made SEGA Master System Emperor MAR (2617)

Critic Reviews

VideoGame SEGA Master System Mar, 1991 5 Stars5 Stars5 Stars5 Stars5 Stars 100
GameHall SEGA Master System Apr 04, 2006 9.3 out of 10 93
IGN Wii Jun 23, 2008 9 out of 10 90
SEGA-Mag (Objectif-SEGA) SEGA Master System Feb 19, 2008 9 out of 10 90
HonestGamers SEGA Master System Jan 12, 2004 9 out of 10 90
Retrogaming History SEGA Master System Jan 22, 2008 9 out of 10 90 SEGA Master System Mar, 2005 8 out of 10 80 SEGA Master System Dec, 2005 8 out of 10 80 (UK) Wii Jun 17, 2008 7 out of 10 70
Video Games & Computer Entertainment SEGA Master System 1988 3 out of 5 60


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1001 Video Games

The Master System version of Alex Kidd in Miracle World appears in the book 1001 Video Games You Must Play Before You Die by General Editor Tony Mott.

Master System 2

Alex Kidd in Miracle World was built into the hardware of the Sega Master System 2 for the European market.


In the first revision of the game Alex eats a riceball at the end of each level. In the later revisions of the game Alex eats a hamburger at the end of each level. Sega changed this because not many people outside of Japan know what a riceball or 'onigiri' is.


  • Power Play
    • 1987 - Best Master System Game '87
Additional information contributed by プルスマン

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Contributed to by Sciere (505776), gamewarrior (5100) and Katakis | カタキス (39505)