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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 Mr. Money Bags
Alex Kidd in Miracle World SEGA Master System This is Alex Kidd, prince of Radaxian. Graphics are simple, but colorful.
Alex Kidd in Miracle World SEGA Master System Alex sees his brother Egle imprisoned here
Alex Kidd in Miracle World SEGA Master System Watch out for the lightning bolt

Promo Images

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

Alternate Titles

  • "SEGA AGES: Alex Kidd in Miracle World" -- Nintendo Switch title
  • "SEGA AGES アレックスキッドのミラクルワールド" -- Japanese Nintendo Switch spelling
  • "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)
Good platform adventure with story, map, inventory and shops. SEGA Master System Andrew Fisher (688)
Difficult but one of the finest platformers ever made SEGA Master System Emperor MAR (2615)

Critic Reviews

IGN Wii Jun 23, 2008 9 out of 10 90
Retro Game Reviews SEGA Master System Nov 13, 2015 9 Stars9 Stars9 Stars9 Stars9 Stars9 Stars9 Stars9 Stars9 Stars9 Stars 90 SEGA Master System Jan 19, 2010 17 out of 20 85
Defunct Games SEGA Master System Sep 09, 2006 84 out of 100 84
Game Informer Magazine SEGA Master System Feb, 2002 8.25 out of 10 82 SEGA Master System Aug 16, 2007 8 out of 10 80
Nintendo Life Nintendo Switch Apr 01, 2019 8 out of 10 80
Retro Archives SEGA Master System Oct 07, 2017 16 out of 20 80
Gamers (Germany) SEGA Master System Aug, 1992 11 out of 15 73
Nintendo Life Wii Jun 12, 2008 7 Stars7 Stars7 Stars7 Stars7 Stars7 Stars7 Stars7 Stars7 Stars7 Stars 70


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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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