- Complete Monster: Jaquio, real name Guardia de Mieux, wants to Take Over the World. Jaquio learns of a legend about a Demon that came to Earth 700 years and went on a killing spree until it was defeated by a Shinobi. The Demon's body was imprisoned in a temple and its spirit was trapped in 2 different statues. Jaquio plans to free the Demon, believing it will grant him great power. Jaquio takes over the temple ruins and kills archeologist Walter Smith and kidnaps Ryu's father Ken in order to obtain the statues. When Ryu Hayabusa confronts Jaquio, the latter threatens to kill CIA agent Irene Lew if Ryu doesn't give him the statue, planning to sacrifice her anyway after Ryu gives him the statue. When Ryu confronts Jaquio again, Jaquio reveals he has made Ken his mind-controlled puppet and gleefully has him attack Ryu. Ryu seemingly kills Jaquio, but Jaquio is revived by evil magic. Jaquio obtains the Sword of Chaos and the Altar of Darkness that will allow him to open a portal and allow a horde of demons to enter Earth, dooming mankind in the process. Jaquio attacks Ryu through his pawn Ashtar, and plans to sacrifice Irene and Ryu to summon the demons to Earth.
- First Installment Wins: Although The Dark Sword of Chaos and The Ancient Ship of Doom introduced gameplay refinements, most people will jump back to the original NES Ninja Gaiden as it's the most recognizable of the trilogy in terms of Demonic Spiders in conjunction with Platform Hell, as well as an easier to digest plot.
- Game-Breaker: The Windmill Technique from the first game, capable of killing every single Mook (and boss) in the game with one use, that is, provided players can plow through an entire level heading towards the boss with minimal jumping attacks or getting other power ups, as each jumping attack triggers the Windmill Technique and eats up ninpo power. However, it's still possible to execute a normal jump attack by holding down while attacking.
- That One Boss: Bloody Malth in the first game throws lightning fast homing projectiles that are nearly impossible to dodge. Unless players have god-like timing, the fight is more than likely going to boil down to a war of attrition. Meanwhile, good luck getting to the fight ensuring Ryu has full health by the time players get to Bloody Malth. Since the battle follows a cutscene, players start the Boss Fight with a full health bar. Because of that, the best strategy really is to just rush him and mash the attack button. It could be considered an act of mercy if there were any evidence the developers were capable of such a thing.
- That One Level: The infamous 6-2 in the first game: 6-1 and 6-3 are extremely difficult as well, but 6-2 takes the cake for cheap deaths and one spot where players have to exploit a flaw in the programming to get past it. If players die even once on any of the three final bosses, they're forced to redo the entire stage at 6-1 again.
YMMV / Ninja Gaiden (NES)