What are the oldest, most unknown titles of PS3? (GA Inside)

I own...

Eternal Sonata
Asura's Wrath
Catherine
Valkyria Chronicles

I think the least known titles I own for it are Folk Lore and Majinn and the Forsaken Kingdom, I'd have to check my shelf to be sure. I never finished either, but enjoyed them enough from what I played (Folk Lore did sort of annoy me, you pick a character to play and then later it forces you to play the other character before you can continue the game, you can guess when i stopped playing)

Coming from my collection, I'll recommend looking up these.

3D Dot Game Heroes
Folklore
rain
Tokyo Jungle

Star Ocean 4? Haven't managed to finish the game though but I had fun playing it.

Bump! No more recommendations? (:

Red Dead Redemption?

:P

I will always stand by Alpha Protocol and James Bond: Blood Stone. I don't know if they're old, but they're still quite unknown and they're decent games. Some others are Puppeteer, Remember Me, Singularity, Dante's Inferno, Rise of the Argonauts, Trinity: Souls of Zill'Ol,
Tales of Graces F, Tales of Xillia. I don't know if games like those are what you're looking for, but there ya go! :D

demon's souls ?

yakuza games

I also like Heavy Rain...that and Uncharted were the main reasons I even bought a PS3

Drakengard 3.

Lair. It plays like gamecube star wars rogue squadron but has dragons instead of star wars. i liked it quite a lot, my complain is the shoehorned sixaxxis mechanics (on the menu you can deactivate quite a lot of them)

Maybe Afrika?

Puppeteer

Honestly, the PS3 is one of the worst consoles to collect for if exclusive games are your thing.

I don't know if these count as "secret/small" or if they are strictly ps3 exclusives, but:

PS3 Journey collection (includes Journey, Flower & flOw)
Ni no Kuni
Hot Shots Golf
Ico & Shadow of The Colossus Collection
Katamari Forever
Disagaea series

Also would second recommendations for:
3D Dot Game Heroes
Eternal Sonata
Tokyo Jungle

If you are willing/able to venture into Japanese exclusives, I can dig up a few other rather unique titles

It's been a while since my PS3 went YLOD. Besides some remastered PS1/PS2 old games, I don't remember much, but anyway, Devil May Cry HD collection, for DMC 1 and 2 (3 is on PC), Ratchet & Clank HD and the rest of the series, Dragon Ball Z Budokai HD Collection.

Info is not great, I know, so BUMP.

I remembered another fairly obscure title that had English in certain Asian country releases:

Aquanaut's Holiday

Thought of a few more:

High Velocity Bowling
The Last Guy
Echochrome
Noby Noby boy
Time Crisis 4
Ridge Racer 7
MLB the Show series

There were also a number of Playstation Move games I remember being interested in at the time they came out, but I never ended up getting a Move unit +controllers so don't know much about them... but these two I remember I had on a wishlist:

The Shoot
The Fight: Lights Out

I would say Bladestorm, but it got ported to pc/ps4 so yeah...

Ok, now i see nobody mentioned WET

bump :) never really gotten into playstation so I can't help all that much.

Ni No Kuni? But this is know, right?

"Unknown" is the keyword´here.
I oldest one I recall is GT prologue that they gave away with every PS3 purchase from the beginning. That was in Denmark - I'm (HIV) positive that it was different from region to region (or country to country).

Unfinished Swan isn't old by any means, but I found it to be rather enjoyable.
I recently played Siren Blood Curse and I can fully recommend it if you are into horror. It's a remake from an old PS2 game, but rather different though it shares some characters and basic story elements. But I see, you already have it.
If you like JRPGs you might enjoy the Atelier series or the Tales of series (though this one is hardly unknown).
Most other games I can think of are either well-known or have already been mentioned.

Ni no Kuni is ready great, there was just a sequel announced for PS4.

Also, you can play Suikoden I to III now if you own a PS3.

Might not be old but are not mentioned here yet and are pretty nice or even awesome.

Supersonic Acrobatic Rocket-Powered Battle Cars (Rocket League is a PS4/PC sequel to this PS3 exclusive)
Datura (found it enjoyable on Move)
Heavenly Sword (quite enjoyable slasher)
Linger in Shadows (rather a demo with clicking but still)
Warhawk & Starhawk (strategy + TPP)
Short Peace: Ranko Tsukigime's Longest Day (if you like anime and platformers)
Anarchy Reigns (sequel to Wii's loud Madworld)
Okami HD (why is it still not mentioned here is beyond me)
White Knight Chronicles II (has the 1st remastered on the disc)
Dragon's Dogma: Dark Arisen (will come out on PC)
Way of the Samurai 3 (if you want to experience some non-linear short stories)