Here's a list of NES games that did not get released in the US. Found it on the net, so corrections are welcome:

I have: 01, 04 and 30. Used to have 22, but gave this to a friend as a present, in mint condition. Didn't know that it was quite rare.

01. Aladdin (Virgin Games)
02. Astérix (Infogrames)
03. Aussie Rules Footy (Nintendo)
04. Banana Prince (Takara)
05. Beauty and the Beast, The (Hudson Soft)
06. Championship Rally (HAL Laboratory)
07. Chevaliers du Zodiaque, Les (Bandai)
08. Crackout (Palcom)
09. Devil World (Nintendo)
10. Dropzone (Mindscape)
11. Elite (Imagineer)
12. Formula 1 Sensation (Palcom)
13. Hammerin' Harry (Irem)
14. International Cricket (Nintendo)
15. Kick Off (Imagineer)
16. Konami Hyper Soccer (Konami)
17. Legend of Prince Valiant, The (Ocean)
18. Lion King, The (Virgin Games)
19. Mario Bros. (Classic Series) (Nintendo)
20. Mr. Gimmick (Sunsoft)
21. New Ghostbusters II (HAL Laboratory)
22. Noah's Ark (Konami)
23. Over Horizon (Takara)
24. Parasol Stars: Rainbow Islands II (Ocean)
25. Parodius (Palcom)
26. Rackets & Rivals (Palcom)
27. Road Fighter (Palcom)
28. Rodland (Storm)
29. Smurfs, The (Infogrames)
30. Super Mario Bros. /Tetris /Nintendo World Cup (Nintendo)
31. Super Turrican (Imagineer)
32. Trolls in Crazyland, The (AGCI)
33. Ufouria: The Saga (Sunsoft)

I have: 01, 04 and 30. Used to have 22, but gave this to a friend as a present, in mint condition. Didn't know that it was quite rare.