Alex Kidd in Miracle World DX is a 2021 remake of the classic 1986 Sega Master System game featuring updated, vibrant graphics, a new soundtrack, and extra levels, say YouTube videos and a Sega Wiki page. While maintaining the original's challenging, one-hit-death platforming, this version adds a Boss Rush mode and allows players to instantly toggle between modern and 8-bit visuals. Alex Kidd in Miracle World DX - REVIEW