I read the reviews, saying it was poor emulation etc. Those where from 2013, so I bought it, thinking it was updated and fixed, or just unlucky people with computer issues etc. Well, the game is frameskipping/lagging a LOT, so much it is unplayable, I tried using an older version and the newest version available through GOG Galaxy. That the menus are somewhat skipping when loading a new screen I do not care about, but the games are unplayable, I tried every option, resolution, scanlines etc, nothing works, the sound does not sound so good either. Raiden 1 does run a bit faster than what I am used too, then suddenly stutters for about an second. And then you are basically dead, when the frames "catch up" I do have The Raiden Project on PSX, Raiden Trad on Mega Drive, so it is a game I am familiar with, maybe my computer is old? But if my Playstation can run Raiden perfectly fine, my computer should really not have any problems with it.. (On a sidenote, it is strange reading the system requrements the old games require today, since I remember the original requirements for many of the old games.. Even the non emulated ones..) If this Raiden collection is ever fixed/patched and plays smooth, it would easily be a 6 Stars out of 5 for me, but at the moment (4/2019) it is not, and looking at other reviews it was not in 2013 either. So if not now, probably never. Too bad, since I really wanted to play Raiden Fighters.
