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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 This is Alex Kidd, prince of Radaxian. Graphics are simple, but colorful.
Alex Kidd in Miracle World SEGA Master System The hidden underground section of Lake Fathom
Alex Kidd in Miracle World SEGA Master System Alex on his motorcycle
Alex Kidd in Miracle World SEGA Master System Inside a peticopter

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. Mumm-Ra (410) 5 Stars5 Stars5 Stars5 Stars5 Stars
Sega's rival to Mario in the action platform category gametrader (233) 3.83 Stars3.83 Stars3.83 Stars3.83 Stars3.83 Stars
Good platform adventure with story, map, inventory and shops. Andrew Fisher (688) 4.2 Stars4.2 Stars4.2 Stars4.2 Stars4.2 Stars
Difficult but one of the finest platformers ever made Emperor MAR (2615) 5 Stars5 Stars5 Stars5 Stars5 Stars

Critic Reviews

Génération 4 1987 99 out of 100 99
GameHall Apr 04, 2006 9.3 out of 10 93
GamesCollection Jun 21, 2008 9 out of 10 90
HonestGamers (Staff reviews only) Jan 12, 2004 9 out of 10 90
IGN Jan 25, 2008 9 out of 10 90
Sega Does Nov 16, 2014 B+ 83
Video Games Mar, 1991 81 out of 100 81
Happy Computer Apr, 1986 80 out of 100 80
Gamers (Germany) Aug, 1992 11 out of 15 73
1UP! Nov 02, 2004 73 out of 100 73


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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

Related Web Sites

Katakis | カタキス (41332) added Alex Kidd in Miracle World (SEGA Master System) on Feb 02, 2003
Other platforms contributed by リカルド・フィリペ (297948), Sciere (636586) and gamewarrior (5048)