Alex kid has to be one of my greatest platform games ever, I think ive only played two of the Alex Kid games i didnt know they had more than two.. :

Alex Kidd in Miracle World, 1986, (Master System)
Alex Kidd: The Lost Stars, 1986 (arcade version) and 1989 (Master System)
Alex Kidd BMX Trial 1987, Master System (Only released in Japan)
Alex Kidd in High-Tech World, 1989, (Master System)
Alex Kidd in the Enchanted Castle 1989, (Sega Mega Drive/Genesis)
Alex Kidd in Shinobi World 1990, (Master System)

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