Mega Man 5

It's a video game developed by Capcom for NES. It is the fifth game in the original Mega Man series and was released in Japan in 1992. The game was released in North America and Europe in 1993.

Original description:

The Vengeance of Protoman!

Protoman has gone berserk! Destroying half the city was not enough. Now, he has snatched Dr. Light and is holding him and the entire city hostage. Speeding to the rescue is Mega Man and his modified Mega Buster, but eight of Protoman's cybernetic soldiers plan to send Mega Man to the scrap heap for good!

Feel the weight of the world on your shoulders as you battle Gravity Man! Chip away at the rock-like defenses of Stone Man and bring him crumbling down! Hit the surf and sail up against the tidal power of Wave Man! Help Mega Man defeat all eight of Protoman's robots and then get ready for the fight that pits brother against brother in the battle of the century!

Instructions

Enter - start (pause);    Arrows - move;    Z - jump;    X - shoot (hold to shoot stronger);

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.