Singleplayer

The Single Player mode of MM8BDM is essentially a play through all the maps in the game with set bots. After so many levels, the player fights special bosses exclusive to singleplayer.

Story

Game Intro

Plot

The story of the game takes place one year after the events of Mega Man 6.

After Mega Man defeated Dr. Wily for the 6th time, the real Mr. X was found and rescued. In celebration of his heroic efforts, Mr. X hosted the second annual robot master tournament with new rules and arenas. With permission from Dr. Light, each robot would have to be reprogrammed use the weapon swapping abilities of Mega Man to keep the competition fair.

During the final announcement of the tournament, Mega Man and Dr. Light's television is interrupted by Dr. Wily. He states that the tournament is a great idea, and that he wishes to prove his genius by entering all his robots to prove once and for all that Dr. Wily is superior to Dr. Light. There are no leads on where Dr. Wily could be hiding, or what he could be plotting.

Recently, a unknown robot (named Maestro by default, although the name can be changed) has taken residence in the Light household, planning on joining the tournament.

Dr. Light decides to enter Mega Man, his other creations, and this newcomer into the tournament to ensure Dr. Wily doesn't have anything hidden up his sleeves...

In-game

The player starts in Dr. Light's lab where Dr. Light explains the situation and briefly how to configure their controls. The player character is a unique robot to the series, a robot known as Maestro, created by an unknown person for the purpose of watching over the events of the Tournament (by entering it), and putting a stop anything that intervenes with the event.

Ending

Ending

Not only does the player win the tournament, but also defeated Dr. Wily in the final battle and all the reprogrammed Robot Masters that entered the tournament. It is never explained how Dr. Wily escaped prison again (or even if the arrest actually happened) or where he was exactly hiding. The final scene shows the player robot encased in gold in an abandoned Robot Museum, where Mega Man X appears and admires the player character before the Credits roll.

Chapters

The game is split up into chapters. Each chapter features Robot Master stages from their respective Mega Man games.

Chapters

Chapter	Game	Mapset	Boss	Secret Boss
Chapter 1: The Tournament Begins!	Mega Man		Mega Man? Yellow Devil	None
Chapter 2: Guts Man Is Missing!	Mega Man 2		Guts Dozer	Enker
Chapter 3: Dr. Wily's Ultimate Scheme!	Mega Man 3		Mega Man?(Round 2) Doc Robots	None
Chapter 4: Dr. Cossack's Robots! Friends or Foes...?	Mega Man 4		Met Catcher & Metool Daddy	Punk
Chapter 5: Proto Man Appears! A Dark Forboding...	Mega Man 5		Mega Man?(Round 3) Dark Man	None
Chapter 6: The Grand Finale! Who Will Be Champion?	Mega Man 6		Reprogrammed Robot Masters Gamma	Ballade
Chapter 7: Dr. Wily Escapes! The Seventh Numbers Strike!	Mega Man 7		Bass	Wily Capsule
Chapter 8: The Giants Of Good and Evil!	Mega Man 8		Duo Evil Energy Robot	None
Chapter 9: The Great Robot Rebellion!	Mega Man & Bass		King	None
Chapter 10: The Wily Wars!	Wily Tower		Buster Rod G. Mega Water S. Hyper Storm H. Genesis Unit	None
Chapter 11: The Rogue Light Robots!	Mega Man 9		Proto Man Mega Mech Shark	Police Chase & Fake Man Quint
???	???	???	???	???
???	???	???	???	???

Boss Rush Mode

Prior to v3a, upon beating the game, a new mode is unlocked called Boss Rush mode. In this mode the player simply fought nearly all the bosses in the game without having to go through each chapter, save for Enker, Punk, Ballade and Wily Capsule. After beating all the bosses, the game's ending plays as if you beat Chapter 6. Boss Rush can be found in Auto's section of the lab.

This feature was removed in v3a, presumably because of the redesigned save feature allowing the player to jump to any point reached in the campaign, including bosses. The functionality is still in the game, however — by typing "set secret_bossrush 1" into the console before entering a boss level, the game will automatically move on to the next boss. As of v4a, all bosses after Chapter 6 are accounted for, including Duo, Buster Rod G, Mega Water S, and Hyper Storm H.

The feature returns in V5, renamed to Boss Attack. After Plug Man returns to Light Labs, and all chapters are beaten, Plug Man allows you to attempt Boss Attack. In this mode the player is given three tries to beat the following bosses back to back: