Your favorite unsung games.

First off, this thread will NOT spiral in to a "my game is more rare than yours".  Don't mistake the title of the thread. Unsung. People might know about it, but it may not have gotten that much praise for one reason or another. So let's state what the game is, what platform you played it on, and why it deserved your attention.  I'll start.
 
Game: Grandia II
Platform: PS2 
Genre: JRPG
Why?: It stands as the only JRPG I have ever played where I intentionally walked in to random encounters. I loved the battle system, and while it was a bit easy, it still remains the most fun RPG in my library. The story wasn't the best, but the voice acting was comparatively good and the gameplay was great.
 
Your turn.

Game: Breakdown 
Platform: Xbox 
Genre: First Person... Fighting? First Person Adventure? Hard to say. 
Why?: Well, the storyline is beyond messed up. It's really interesting, and you get to go to some very strange places and the combat is extremely satisfying. It's kinda like Zeno Clash, except it came out like years and years ago. It was a Japanese-made Xbox exclusive so it wasn't really heard of very much, but nonetheless an extremely fun and unique game. 
 
Can I do another? 
 
Game: Gunvalkyrie 
Platform: Xbox 
Genre: Third person mech suit and jetpack based shooter 
Why?: Gunvalkyrie was, along with Jet Set Radio Future, Sega GT 2002, Shenmue 2, and the Otogi series, one of Sega's excellent Xbox exclusives. The games they were churning out back then (developed OR published) were simply amazing. This game is probably my favorite of them all and it comes down to one thing: the controls. Gunvalkyrie featured some of the most ass-backward control you'd find in a game, even today, but once you learned it you almost felt like you took a course or something. The controls became so fluid and intuitive, you would look down at your hands and wonder how the hell you managed to multitask so much. It was a balance between saving enough energy to stay in the air (The ground is covered in enemies, too much to handle from down there) and gunplay. Amazing sound effects, Wicked graphics, and truly thrilling gameplay. Too bad I still have my copy with no Xbox to play it on :(  
 
@BoogieWithStu: Boogie With Stu is one of my favorite Led Zep songs :D

I don't know if it was unsung at the time of its release as I didn't really read much from the games press at the time but...
 
Game: Jet Force Gemini
Platform : N64
Genre : Third Person Shooter
Why: I will wholeheartedly admit it may just be because I hadn't really ever played a shooter till this game but the ridiculous setting (ants and other bugs against tribal bears) and characters (a dog with a gun attached to its back and hover paws) just added to my enjoyment of the game. I do recall the game being very difficult but I had a blast playing multiplayer with friends. The only setback I can think of was the ridiculous mandatory collectathon of captive bears in order to beat the game. I never got to witness the ending as a kid because even as a child I refused to embark on a quest to "collect them all." Don't get me wrong, I don't want a sequel to this game or even a remake but it does take me back to remember the time spent with this game.

It isn't all to rare or unknown, but it's far from being a standout game that practically everyone knows about; 
 

Game : God Hand 

Ohh I almost forgot. 
 
Shin Megami Tensei: Nocturne/Lucifer's Call 
As much as I LOVE Persona 3 and 4, people need to STFU about them just because of the Endurance Run. Nocturne is the absolute pinnacle of the SMT series so far in my mind and one of the greatest JRPGs ever made in my personal opinion. I enjoyed every single second of this game, it's unique in almost every facet, the story is intriguing (if a little sparse) and it offers a lot of depth in it's combat system as well as hundreds of hours of content to play through. 
 
Seriously, if you even pretend to be an SMT fan, you MUST play this game. It's amazing. And it also features two rather unique elements. 1 being the end of the world in the games opening scene. 2 being Dante from Devil May Cry. He starts out as an enemy, but can be recruited to your team later on.