Ninja Ryukenden (also known as Shadow Warriors in some regions) is a side-scrolling action game released for the NES. Developed by Tecmo, it's known for its fast-paced combat, challenging levels, and memorable boss fights. It introduced the iconic Ryu Hayabusa, a character that became a staple in the Ninja Gaiden franchise.  The game features an intricate storyline, unique level designs, and various weapons, enhancing its replayability. This title is considered one of the landmark titles in the side-scrolling genre.

Ninja Ryukenden (Japan)

Ninja Kun - Ashura no Shou (Japan)