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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 on his motorcycle
Alex Kidd in Miracle World SEGA Master System A bull charging at Alex
Alex Kidd in Miracle World SEGA Master System Alex inside the Radactian Palace
Alex Kidd in Miracle World SEGA Master System Alex in the hoverboat

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 (707)
Difficult but one of the finest platformers ever made SEGA Master System Emperor MAR (2613)

Critic Reviews

Retro Game Reviews SEGA Master System Nov 13, 2015 9 Stars9 Stars9 Stars9 Stars9 Stars9 Stars9 Stars9 Stars9 Stars9 Stars 90
Sega Pro (UK) SEGA Master System Apr, 1993 90 out of 100 90
Sega Collectors Guild SEGA Master System Mar 14, 2004 90 out of 100 90
Game Informer Magazine SEGA Master System Feb, 2002 8.25 out of 10 82
Pixel-Heroes.de SEGA Master System Dec, 2005 8 out of 10 80
Sega-16.com SEGA Master System Sep 19, 2016 8 out of 10 80
Retro Archives SEGA Master System Oct 07, 2017 16 out of 20 80
Retro Gamer Nintendo Switch Apr 18, 2019 80 out of 100 80
Eurogamer.net (UK) Wii Jun 17, 2008 7 out of 10 70
PixlBit SEGA Master System Sep 02, 2020 3 Stars3 Stars3 Stars3 Stars3 Stars 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 Rik Hideto (463973), Sciere (789925), gamewarrior (5042) and Katakis | カタキス (42875)
atari missile command