Mega Man: Dr. Wily's Revenge

Mega Man: Dr. Wily's Revenge, known as Rockman World (ロックマンワールド) in Japan, is the first Mega Man game for the Game Boy in 1991. The game was also released for the Nintendo 3DS eShop.

Overview
The game recycles content from the original Mega Man for NES and its sequel, Mega Man 2. At the start of the game, only four Robot Master stages are available to choose, all of which are from Mega Man. The second four Robot Masters, all of which are from Mega Man 2, are fought as bosses in the Wily Castle. This would become a staple of the Game Boy games until Mega Man V, the only Mega Man game for Game Boy not to recycle large amounts of content from the NES games.

Story
Thanks to the efforts of Mega Man, the super robot created by Dr. Light, Dr. Wily's ambitions did not come to fruition. Peace had returned to the world, but Dr. Wily had secretly altered the industrial robots developed by Dr. Light. After everything that had happened, Dr. Wily had not abandoned his desire for world domination. In order to stop Dr. Wily from realizing his dream, Mega Man headed to the city.

Once the four Robot Masters are taken down, Mega Man heads to the Wily Castle only to discover that four more Robot Masters await him there. To make matters worse, Dr. Wily has constructed a new powerful robot, a Mega Man Killer known as Enker. Enker has the ability to absorb Mega Man's shots with his lance and return a powerful blast of energy at him with his Mirror Buster; however, Enker is defeated, and Mega Man chases Wily to his Wily Station above the Earth, using Enker's own Mirror Buster to defeat him. After the battle, the Wily Station is destroyed and Mega Man returns to Earth inside a space shuttle.

First Four Robot Masters
Unlike its NES counterpart, only four Robot Masters are available to choose from in the start of the game. These four are taken from the original Mega Man.

Second Four Robot Masters
After the first four Robot Masters are defeated, four others must be fought in the Wily Teleport System inside the Wily Castle. These Robot Masters are taken from Mega Man 2.

Final Boss
After Enker is defeated, Mega Man must fight the Wily Machine I in Wily Station.

Trivia
thumb|200px|right|Unused Track
 * The game was originally meant to be called Mega Man World outside of Japan as the Rom had sprites with the word "World" in the title screen, but for unknown reasons the title screen was changed to only Mega Man.
 * The title on the package is given as Mega Man: Dr. Wily's Revenge, but the actual on-screen title just says "Mega Man."
 * The game has an unused track for the ending.
 * The concept of fighting two groups of Robot Masters (4 in each group) would later be used in Mega Man 7 and 8.
 * If the player obtains the Special Weapons from the Mega Man 2 Robot Masters at the end of Wily's castle and end up dying before defeating Enker, the stage will restart from the beginning, and the player loses any weapons obtained from those Mega Man 2 bosses. This makes this the only classic Mega Man series game (and quite possibly only game in the entire series) in which it is possible to lose Special Weapons that have been obtained.