Alex Kidd in Miracle World (アレックスキッドのミラクルワールド Arekkusu Kiddo no Mirakuru Wārudo) is a 2D platform video game for the 8-bit Sega Master System video game console. It was first released in Japan on Saturday, November 1, 1986, and then was distributed to Europe, Australia and the United States in 1987.
The game was designed by Hayashida Kotaru.
It was arguably the most widely known game in the Alex Kidd series by SEGA Corporation, due to it being built internally into most Master System II consoles as an included bundled title. It is also the very first game in the Alex Kidd series created for this character, and the most popular of all Alex Kidd games.