Nintendo World Championships 1990 is a unique cartridge produced for a Nintendo-sponsored competition of the same name. The game itself is not a retail release but rather a challenging compilation of excerpts from several NES titles, designed to test competitors' skills.  The gameplay is a rapid-fire sequence of challenges from games like Rad Racer and Metroid, with high difficulty levels.  It's highly collectible today for its rarity and historical significance as a marketing event.

Nintendo World Championships 1990 (USA)

Ninja Ryukenden II - Ankoku no Jashin Ken (Japan)