Capcom clarified the length of Mega Man Legends 3 Prototype Version a bit by noting the Nintendo 3DS download has 10+ missions. Instead of Mega Man, you play the game as Barrett and Aero, a new heroine selected by fans.
While the game is loading, players will see screens with concept art like the images below.
After Barrett completes the main missions and (presumably rides into the sunset with Aero), players will unlock a debug menu. This will allow fans to explore Mega Man Legends 3 beyond the scope of the missions and play with special move settings.
Mega Man Legends 3 Prototype Version will launch with the Nintendo 3DS eShop at the end of this month.