Are NINJA GAIDEN and Ninja Ryukenden the same game?

In 1988, Tecmo released an action game starring a ninja on the Famicom. In Japan, its title was written as Ninja Ryukenden; on the overseas NES, it was called NINJA GAIDEN. They are not different works in the series, but the same game under different regional titles.

Nintendo's official Japanese page lists this work as Ninja Ryukenden, with a copyright year of 1988, and explains that the protagonist Ryu Hayabusa follows his father's last words, takes the Dragon Sword to America, uses ninjutsu, wall-kick jumps, and advances the story through visual scenes. Nintendo's official European page lists it as NINJA GAIDEN, describing Ryu Hayabusa going to America to avenge his father, with the game featuring animated-style cutscenes, six acts, 20 side-scrolling areas, the Dragon Sword, and Ninpo.

The protagonist, the motive for going to America, the Dragon Sword, Ninpo, and the cinematic cutscenes all correspond one-to-one. So for the 1988 Famicom/NES original, Ninja Ryukenden and NINJA GAIDEN are only regional title differences, not two games with unrelated stories.

To confirm that the two titles point to the same game, the most direct way is to compare the official pages. The Japanese official site says the protagonist takes the Dragon Sword to America, and the European official site says Ryu Hayabusa goes to America to avenge his father; the Japanese site mentions ninjutsu and wall-kick jumps, while the European site lists Ninpo and side-scrolling areas. These key elements completely overlap, which is enough to show they are the same game.

Also, don't assume that because the word "gaiden" is often translated as "side story," this original is a side story to some other work in terms of story. The official sources present it as Ryu's original adventure, the beginning of the entire series.

This site also has a PC Engine entry for Ninja Ryukenden, released in 1992. It is not a sequel, but a port based on the 1988 original, remade for the PC Engine hardware.

The table below quickly distinguishes the two versions:

The PC Engine version uses the same story as the original: Ryu Hayabusa, descendant of the Dragon Lineage, goes to America to avenge his father. But KONAMI's official page clearly states that all graphics in this version were redrawn, the sound was completely updated, and the demo scenes known as Tecmo Theater remain between stages.

Therefore, it is neither a byte-for-byte identical version of the Famicom/NES original, nor should it be simply described as running under emulation. It is a port based on the original adventure, remade for different hardware.

At the same time, it should be emphasized that the PC Engine version is not NINJA GAIDEN II or a new sequel in the series. It uses the original protagonist and the story of going to America for revenge, and the official copyright still marks the original as 1988, while listing the PC Engine version as 1992.

This site includes two precisely playable entries. One is the 1988 Famicom/NES original, corresponding to the regional title pair of Ninja Ryukenden on the Japanese official page and NINJA GAIDEN on the overseas official page. The other is the 1992 PC Engine Ninja Ryukenden, representing a remade port of the same original story on PC Engine.

Both entries maintain neutral descriptions: the 1988 Famicom/NES version represents the original 8-bit version with its original graphics and sound pacing; the 1992 PC Engine version is for readers who want to see redrawn graphics and remade music. No version is claimed to be absolutely better.

The choice advice is based only on verified differences. To start from the original version, choose the 1988 Famicom/NES NINJA GAIDEN; to experience the same original story with redrawn graphics and new sound on PC Engine, choose the 1992 PC Engine Ninja Ryukenden.