Here’s a brief over-view of the Alex Kidd games by Sega.

Ratings
Alex Kidd in Miracle World: 3½/5
Alex Kidd and the Lost Stars: 2½/5
Alex Kidd – BMX Trial: 0/5
Alex Kidd in High Tech World: 1½/5
Alex Kidd in the Enchanted Castle: 3/5
Alex Kidd in Shinobi World: 2½/5