!! The Original Games
* The climatic battle in ''3'', against a hovering robot and racing against the clock to beat it. Given the higher default difficulty for non-Japanese versions, you WILL feel awesome when you get the good ending (by beating the boss before time runs out).
!! The Fan Remake
* The Fan Remake deserves mention here, as much effort has been put into it, and it is generally praised as a worthy successor. Even Sega gave it a subtle thumbs-up, seeing as how they issued the cease-and-desist order only after allowing the remake to circulate around the Internet for some time.