Mega Man Legends 3 (aka Rockman DASH 3 in Japan) is a cancelled action game that was in development by Capcom for the Nintendo 3DS. The game was announced in July 2010 and it was going to be created with the help of the fans, thanks to the MML3 Developer Room website:
Yes, the Developer Room, or as it’s more popularly known, the “Devroom” is a place where people interested in the upcoming Mega Man Legends 3 title for 3DS can convene to exchange ideas on the game’s development. We hold monthly Devroom events where members can submit their ideas for content, some of which will be selected by the game’s development team to actually be implemented in the game.
A playable Mega Man Legends 3 prototype was going to be released with the launch of the 3DS eShop download service, to let players to test the game and give even more feedbacks about how to develope it. Sadly, something went wrong and on the 18th july 2011, Mega Man Legends 3 was officially cancelled:
Unfortunately it was not felt that the Mega Man Legends 3 Project met the required criteria, and it is with regret that we must announce that the Mega Man Legends 3 Project has been cancelled, meaning that Capcom will not be releasing the Prototype or the full game. Additionally, updates of the Mega Man Legends Developer Room will cease as of today, though the North American Developer Room and its forums will remain open indefinitely.
The prototype was never released on the 3DS eShop, but we hope that in the future it could be at least leaked somehow.