The game was released on October 8, 2010, at 8PM Greenwich Mean Time.
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. With no leads on where Dr. Wily could be hiding, or what he could be plotting, Dr. Light decides to enter Mega Man and his other creations to the tournament to ensure Dr. Wily doesn't have anything hidden up his sleeves...
The gameplay is similar to classic Doom deathmatch modes, particularly to that of Skulltag. Weapons are found in the various levels, but each level contains a different set. There are over 50 levels, which consist of 8-bit textures & sprites based on past robot master's stages. Actions taken place will behave exactly the same as they do in the classic Mega Man games, but in a 3d perspective (with some minor exceptions). You can play as Mega Man, Roll, Proto Man, Bass, the Mega Man Killers and any Robot Master from Mega Man 1 to 6 but differences regarding abilities and weaknesses are not added, meaning all players are balanced in terms of skill and do not use their respective weaponry except the common Buster.
This is the second trailer of MM8BDM showing off more levels, gameplay, modes of play, singleplayer bosses and more.