Alex Kidd in Miracle World launched with the Sega Master System II baked directly into the BIOS, making it the default boot game for millions of kids who never owned a cartridge. Sega's original mascot before Sonic took over, Alex Kidd punches through enemies and rocks, takes on bosses in Rock-Paper-Scissors matches, and tears through vehicle sections in helicopters, motorcycles, and watercraft. Released in 1986, it was Sega's direct answer to Super Mario Bros. and remains a defining title of the 8-bit era.
The Vault · 1986
Alex Kidd in Miracle World
Sega's original mascot. Built into the console. No cartridge required.
Alex KiddSega Master SystemActionPlatformer
Screenshots
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How to Play TodayYour options for running this game in 2026
Original Hardware
Track down the SMS cartridge, or if you have a Master System II, just plug the system into the wall and hold the reset button. It is built right into the BIOS. Playing on real hardware is highly recommended since it feels more responsive than emulation.
Modern Re-release
Included in the Sega Genesis Classics collection on Nintendo Switch and PlayStation. The remake, Alex Kidd in Miracle World DX, is also widely available and lets you toggle between old and new graphics on the fly.
Emulation / Other Options
Available on Steam as part of the SEGA Mega Drive and Genesis Classics hub. Alternatively, grab a Mega EverDrive Pro to load the ROM on original Genesis hardware.