Ninja Gaiden episode II: The dark sword of chaos

This is the second installment in the Ninja Gaiden trilogy for the NES and it was released in 1990. The events in Ninja Gaiden II take place one year after the events in the first Ninja Gaiden game.

Original description:

In this action packed sequel to Ninja Gaiden you are Ryu Hayabusa the ultimate Ninja action hero. Destroy everything in your path as you embark on a quest to avenge your clan and prevent destruction of the human race from a brutal and relentless enemy. Armed with special moves, deadly weapons and the ruthlessness of a Ninja, you shall leave a wake of death in the name of honor.

Instructions

Enter - start (pause);    Arrows - move;    Z - jump;    X - attack;    Esc = exit fullscreen;

You can change keyboard settings, save (F5) and load (F8) the game.
Put your mouse over the game and choose your settings, you can also play the game in fullscreen.