Hi there, I've been working on this list and want to make sure I have them all - some of them aren't on many lists.
 

• Aladdin
• Astérix
• Aussie Rules Footy (AUS)
• Banana Prince
• Beauty and the Beast
• Championship Rally
• Chevaliers du Zodiaque
• Crackout
• Devil World
• Dropzone
• Elite
• Formula 1 Sensation
• Hammerin’ Harry
• International Cricket (AUS)
• Kick Off
• Konami Hyper Soccer
• Legend of Prince Valiant
• Lion King
• Mahjong (Hong Kong)
• Mario Bros. (Classic Series)
• Mr. Gimmick
• New Ghostbusters II
• Noah’s Ark
• Over Horizon
• Parasol Stars: Rainbow Islands II
• Parodius
• Rackets & Rivals
• Rainbow Islands (Developed by Ocean, different game than NTSC version)
• Road Fighter
• Rodland
• Smurfs
• Super Mario Bros. / Tetris / Nintendo World Cup
• Super Turrican
• Trolls in Crazyland
• Tecmo World Cup Soccer
• Ufouria: The Saga

That's all the Licensed exclusives in the PAL + Hong Kong region. Here's the unlicensed exclusives.

For Sachen I've excluded games that are found in the HES library. For Gluk and HES i've excluded games that are found in the NTSC-USA library. The three Sachen X-in-1 games also have exclusive games not found on any other SACHEN game cartridge.

HES (Australia)

1. 4 in 1 Mindblower Pack (Has one exclusive game in there, Math Quiz)
2. Arctic Adventure, Penguin & Seal
3. Duck Maze
4. Jackpot
5. Little Red Hood
6. Othello
7. Pipemania

Gluk (Spain)

1. Creatom
2. El Bloque Magico (Magic Block)
3. El Destructor (Destroyer)
4. Gluk the Thunder Warrior
5. La Gran Aventura Submarina (The Great Undersea Adventure...or, Sea of Dreamland)
6. La Guerra del Golfo (The Gulf War...or, War in the Gulf)
7. Policeman
8. Skate Boy
9. Tanque (Tank)

SACHEN

1. Auto-Upturn
2. Bingo 75
3. Challenge of the Dragon
4. Chess Academy
5. Chinese Checkers
6. Cosmo Cop
7. Dancing Blocks
8. Final Combat
9. Gaiapolis
10. Great Wall, The
11. Happy Pairs
12. Hell Fighter
13. Hidden Chinese Chess
14. Honey Peach
15. Huge Insect
16. Jovial Race
17. Jurassic Boy
18. Locksmith
19. Lucky Bingo
20. Magic Cube
21. Magical Mathematics
22. Mahjong Partner
23. Mahjong School
24. Mahjong Trap
25. Mahjong World, The
26. Middle School English
27. Millionaire
28. Olympic I.Q.
29. Po Po Team
30. Poker I
31. Poker II
32. Poker III
33. Poker Mahjong
34. Pyramid II
35. Q-Boy
36. Rockball
37. Silver Eagle
38. Strategist
39. Street Heroes
40. Super Cartridge Version 2
41. Super Cartridge Version 3
42. Super Cartridge Version 8
43. Super Pang I
44. Super Pang II
45. Taiwan Mahjong
46. Taiwan Mahjong II
47. Tasac
48. Thunder Blaster Man
49. Tough Cop

There's also some Brazil stuff too but I haven't finished that list. Crime Busters is definitely one unlicensed game for that region.

How is: Mario Bros. (Classic Series) any different than the Mario Bros. most people know? Also, what region was it released in?

It comes in ITA, and NOE variants to my knowledge.

I haven't played this particular variant yet, but from what I hear...

There are new levels, controls are closer to the arcade, and graphics and audio are improved, and other changes that make it resemble the actual arcade game.

I want to say that it was a German release. It has updated graphics and music, new levels, and it allows you to change jump direction midair. It also has stage intermissions. I've played it with Leon and it feels really different from the regular Mario Bros. release.
 

I think ruling out the multicarts 4-in-1 Fun Blaster Pak and 4-in-1 Total Funpak is cheating since they don't have direct analogues on a single cart (like Real Player's Pak) but just my opinion  

I guess if you go too far down that hole, you'll need to get Probotector and Teenage Mutant Hero Turtles and all that too!

I personally don't consider multicarts unique unless they have unique content. Something like Super Mario Bros. / Duck Hunt / World Class Track Meet, or Myriad 6-in-1 presents nothing new so they're just rereleases, and variants. Maxi 15 for example is absolutely a unique game since there's one game on it that's unique across the entire NES library, Stakk'm.

But then there's a slippery slope. I think they released butt-plug and non-butt-plug versions of that cart in Australia, right?   

As in, you plug another cart into it piggyback. 

Indeed, there's even two different list of games which means it would qualify as it's own unique game...with the same name. Like Indiana Jones and the Last Crusade, Taito vs Ubisoft.

Which is why I don't count multicarts as truly unique....only their contents.

Edit: Kinda sounds like I'm backpeddling so let me clarify.

A multicart is just that, multiple games in one cartridge. The shell doesn't matter for any game (read Tengen Gauntlet licensed vs unlicensed). So it's literally JUST the games that count as being games. STAKK'M is the unique game in Maxi 15. Action 52 is not a single game, but 52 of them....Myriad/Caltron is not 1 game but 6, all of the X-IN-1 sachens are not one game but X....so now take the list of every one of those and see what overlaps.

Whatever is overlapping the other, pick one. Ta-da! You have your unique game list.

Depending how exclusive you want to be, the french dragon ball z game is apparently pretty different from dragon power released in the USA.

Pretty good list there, I think you may have named them all.

Fantastic! Thanks everyone.

And for the record that Mario Bros PAL exclusive game is badass. I prefer to play that over any other version.

Yep, so is Probotector for the same reason, they changed the characters and enemies. Also, Top Players Tennis, Alex DeMeo's Race America, and Al Unser Jr. Turbo Racing vs their PAL counterparts are missing the titicular people of the NTSC-USA version.

Then you have a real oddball like Track & Field in Barcelona vs. Track & Field. It has different publishers, different regions, different product codes, different title, COMPLETELY different "point" or "backstory", but it's the same exact game, gamplay wise the exact same context of Stadium Events vs. World Class Track Meet. Yet somehow doesn't make it to PAL exclusive lists  

Out of interest, I had lately been researching NES games that been officially released in Europe or Australia, but not North America. The final list I had ended up with has the 35 games Leon had listed above (though some titles are reworded), but with Mahjong removed, as there doesn't seem to be any convincing source of Mahjong having been officially released in Europe or Australia:

Asterix

Aussie Rules Footy

Banana Prince

Championship Rally

Crackout

Devil World

Disney's Aladdin

Disney's Beauty and the Beast

Disney's The Lion King

Dropzone

Elite

Formula One Sensation

Hammerin' Harry

International Cricket

Kick Off

Konami Hyper Soccer

The Legend of Prince Valiant

Les Chevaliers du Zodiaque : La Légende d'or

Mario Bros. (Classic Series)

Mr. Gimmick!

New Ghostbusters II

Noah's Ark

Over Horizon

Parasol Stars: Rainbow Islands II

Parodius

Rackets & Rivals

Rainbow Islands: Bubble Bobble 2

Road Fighter

Rod Land

The Smurfs

Super Mario Bros./Tetris/Nintendo World Cup

Super Turrican

Tecmo World Cup Soccer

The Trolls in Crazyland

Ufouria: The Saga

So how do you guys prefer playing PAL titles? I was thinking of getting RetroUSB AVS and a PAL compatible TV.

On a NES.
Note that a majority of PAL games didn't have the gameplay timing adjusted to fit the 50hz updates, so they still play better on an NTSC NES.

Possibly stupid question, but are there any PAL "exclusives" that are actually exclusive to the PAL region? All of the titles on these lists that I know about were also released in Japan. Meanwhile the US had a lot of exclusives that were actually completely exclusive (Kickmaster, Arkista's Ring, StarTropics II, GI Joe, etc)

So I just bought the PAL version of Sword Master and the PAL exclusive Crackout. (I haven't received them yet.) I'm confused by a lot of the info online. So you think Sword Master maybe will play better on NTSC? And maybe crackout could be off since it was a PAL exclusive?

Not sure who tested it, but according to my notes, Sword Master had the music timing adjusted for PAL, but the gameplay was untouched, and will therefore still run slower (as if you put the NTSC cart into a PAL NES)

Unfortunately that's the case with a majority of "late" era NES titles.

So a lot of PAL titles run incorrectly on both PAL and NTSC consoles?

Yeah, PAL got shafted good. There's a reason most of us Europeans almost exclusively buy imports. It's expensive, but it's the only way to go.

New Ghostbusters II is adjusted for 50hz. A little pro tip, practice in 60hz where everything is slightly faster so when you switch back to 50hz everything is a breeze.

I know for sure Asterix only had a European release. I believe the Konami Noah's Ark game was exclusive as well.

 

Quite a few actually: 
Alladin
Asterix
Aussie Rules Footy
Beauty and the Beast
Dropzone
Elite
International Cricket
Kick Off
Konami Hyper Soccer
The Legend of Prince Valiant
The Lion King
Mario Bros. Classic Series (debtable, it does differ from Kaettekita Mario Bros.)
Noah's Ark
Parasol Stars
Rackets & Rivals
Rainbow Islands (different port)
The Smurfs
Super Turrican


 

Thanks for the response. I'm familiar with almost all of those games (and own a lot of them), and never realised that many of them never had a US release.  

Seeing this thread again made me wonder if anyone has ever actually seen an Over Horizon -1 code cart or book?  The NA Database has always said that a cart only variant exists but has no picture of it.  Funny thing is that the box shown in the NA Database is actually the -1 code box variant.  I have both as pictured below showing the differences on my two boxes.  However I've never actually seen a -1 code cart or book.  Anyone have proof they exist or am I good with my NOE CIB and NOE-1 box?  Thank you.  ~E~