Heres a list of semi-rare PS2 games. Again some games may be missing and this list is an opinion of what I think are rare PS2 games. I am a huge collector and research games everyday. I like to know print runs, limited editions, developers, fluxuating prices, different editions and so on and so on. I feel I am very educated in this but may be wrong on some of the games. Also please note that reprints of rare games have caused the game to become more uncommon than rare such as Digital Devil Saga 1 and 2 and the Fatal Frame series. However, games like the original Fatal Frame has differences in the original version and the reprinted version that are noticable. I would consider the original version of Fatal Frame as rare than a Honorable mention or uncommon. The difference is placement of the screen shots on the back, the size lettering on the back, and even some wording. You will notice that the reprints of rare games do have small differences or are missing stuff completely like Shin Megami Tensei's Nocturne had a Limited Edition Sountrack in some of the original printed game case. Some of the reprinted Nocturnes case stated is have 2 discs but is missing the soundtrack, making that soundtrack extremely rare since none of the reprints have the soundtrack and Atlus is noterious for low print runs anyway. Well back to business, heres a list of Honorable Mentions of Rare PS2 Games.
Alien vs. Predator:Extinction
Arcana Heart
Baulders Gate Dark Alliance 2
Baroque
Buffy the Vampire Slayer
Buffy the Vampire Slayer:Chaos Bleeds
Bujingai:The Forsaken City
Castle Shikigami 2
Chaos Wars
Clock Tower 3
Dark Angel:Vampire Apocalypse
Dark Cloud 2
Dawn of Mana
Dino Stalker
Disgaea:Hour of Darkness (Black Label)
Disgaea 2:Cursed Memories
Dog's Life
Drakengard
Drakengard 2
Dynasty Tactics
Dynasty Tactics 2
Dynasty Warriors 3 X-treme Legends
Dynasty Warriors 4 Empires
Dynasty Warriors 4 X-treme Legends
Dynasty Warriors 5 Empires
Dynasty Warriors 6
Fatal Frame (reprinted)
Fatal Frame 2:Crimson Butterfly (reprinted)
Fatal Frame 3:The Tormented (reprinted)
Forever Kingdom
Ghost Hunter
Goblin Commander
Gradius 3 and 4
Grandia 2
Grandia 3
Growlanser Heritage of War (regular edition)
Growlanser Generations (regular edition)
Guilty Gear X
Guilty Gear XX
Guilty Gear XX Accent Core
Gungrave
Gungrave:Overdose
Gungriffon:Blaze
Half-Life
Indigo Prophecy
Jade Cocoon 2
Katamari Damacy
Killer 7
King's Field:The Ancient City
Klonoa 2
Legaia 2

uel Saga
Magna Carta:Tears of Blood (regular edition)
Mana Khemia:Alchemist of Al Revis (regular edition)
Mega Man Anniversary Collection
Mega Man X7
Mega Man X8
Metal Gear Solid 2:Substance
Metal Gear Solid 3:Subsistance
Metal Saga
Mobile Suit Gundam SEED:Never Ending Tomorrow
Monster Rancher 3
MS Saga:A New Dawn
Ninja Assult
Onimusha

awn of Dreams
Phantasy Star Universe:Ambition of the Illuminus
Phantom Brave
Pool Paradise
Predator:Concrete Jungle
Red Ninja:The End of Honor
Resident Evil

ead Aim
River King:A Wonderful Journey
RPG Maker 3
Samuari Warriors 2
Samuari Warriors 2:Empires
Samuari Warriors 2:Xtreme Legends
Samuari Western
Seven Samuari 20XX
Shadow Hearts:Covenant
Shadow Hearts:From the New World
Shadow of Destiny
Shining Force EXA
Shining Force NEO
Shining Tears
Shin Megami Tensei

evil Summoner 2
Shin Megami Tensei

igital Devil Saga
Shin Megami Tensei

igital Devil Saga 2
Silpheed:The Lost Planet
Soul Nomad and the World Eaters
Steambot Chronicles
Stella Deus:The Gate of Eternity
Suikoden 3 (reprinted)
Suikoden 4
Suikoden Tactics
Tales of Legendia
Tetris Worlds (this game isn't rare but their are 3 different art inserts for it. 1 is rare)
The Nighmare Before Christmas:Oogies Revenge
Trapt
Valkyrie Profile 2:Similaria
Warriors Orochi
Warriors Orochi 2
Warship Gunner 2
Wild Arms 4
Worms 3D
I know there are more games that I didn't mention but this is still the biggest, most comrehensive list that ive seen. Again please dont post about how many of this game you can find because even if you arent blowing smoke, that is probably a great find then. I remember when I was in the ARMY in a podunk town in Louisiana at the PX. They literally had 20+ copies of Digital Devil Saga 2 factory sealed and 70% off so they were like 10 bucks. I picked 1 up because at the time I was just playing games, not collecting. And note that this was 4 years ago before they reprinted DDS2. That game was super rare at the time but a store had 20 copies. Point being just because you can find a ton of copies doesnt mean it isnt rare. Pick that stuff up then or better yet get ahold of me and tell me where it is! One guy tried to tell me that Firefighter FD 18 wasnt rare and that his local walmart had tons of copies for $10. I told him to buy everyone and ship them to me and I'd pay him $20 a piece for them. Anyway thanks for looking at my list and I hope this helps some of you all out there wondering what the rarest PS2 games are. There are some seriously lame lists out there and it seems to me that not many people on these posts have a clue of what is really rare or there are a gazillion posts on Marvel vs. Capcom 2 being rare. I think everyone knows that already. But seriously, some havent even heard of some of these these games like Ar Tonelico:Melody of Elemia Limited Edition Box set. That is truly a rare game when most dont even know it exists.