I love, love, LOVE this game, from the brilliant mind that created the Ace Attorney series, Shu Takumi, comes a "brand new" (well, 2010 but I digress) where you control an amnesiac ghost who seeks to find the cause of his murder as well as his identity.
I have waited for a PC port of this game for years, I played it on the original DS release and it is one of the few games that I have replayed over and over until I lost the cartridge one day.
I'd recommend checking it out if you have have the time. (You can spare a couple afternoons, can't you?)
Well written characters, great story, interesting puzzles (even if you normally dislike them), banging music, and an overarching mystery, the game's got it all.