If a genie came out of a bottle, and told you that you get one guess as to when Raiden II will be working in MAME, and if you guess correctly, then you will receive a hundred bucks. What would your guess be? You don't have to guess the exact date, just a time frame like "In 3 Weeks" or "In 5 Months" or "In 1 Year", etc... you get the picture.
And you'd be foolish to say you don't know because even if you have absolutely no clue, then you still might as well guess and take a shot to win a hundred bucks.
Alot of people have said how Raiden II is so great and their favorite shmup. I've never played it, but I've watched YouTube videos of it. I don't see how this Raiden is so special and different than other Raidens. But, like I said, I've never played it so I wouldn't know.