Ninja Gaiden Trilogy was a game released on August 10, 1995 for the Super Nintendo Entertainment System that included all three of the original NES games with remastered graphics and music and tweaks in the gameplay, notably, the third game now has unlimited continues like the other games.
Though it is on a more powerful console, the games suffered from slowdown, unresponsive controls and finicky hit detection. There was also censorship added in some areas included changing blood from red to green.
Ninja Gaiden Trilogy also included a password system for all three games (Ninja Gaiden, Ninja Gaiden II: The Dark Sword of Chaos, Ninja Gaiden III: The Ancient Ship of Doom) which would let you could continue where you left off.
The game was also released as Ninja Gaiden Trilogy in the PAL Region even though when you played one of the games, the title still read Shadow Warriors, even on the third game which wasn't originally released in the PAL Region.