Super Mario Bros Doomsday

It is the year 2012 for the Mushroom Kingdom and the end of the world is upon the citizens who inhabit the Mushroom World. When Bowser hears of an ancient key that can grant him world domination, he plans to find it and use it to take over the world. However, Mario is one step ahead of him and knows the key's location.
Bowser, knowing that Mario will find the key before him, joins forces with other villians. It is up to you to find the key before Bowser and save the world.