Final Boss: One Mighty Mouse!

Final Boss: One Mighty Mouse!, also referred to as Endless Hearts, is the final level of the Macro Zone in Super Mario Land 2: 6 Golden Coins. This level takes place in the attic of the house. The sewer rat is fought at the end of this level.

Layout
At the start of the level, where Mario comes out of the chimney, there are large books which can be used as platforms. First, there is a ? Block which contains a Fire Flower, next to a Goomba on a book, with a Koopa Troopa on a taller set of books. There is another ? Block soon after. If Mario hits it, it reveals a 1-Up Heart which is stolen by a collector. There are then some coins and a couple of Goombas. There are then more coins above conveyor blocks which lead Mario to a short wall of spikes. Above the coins is a Piranha Plant in a pipe, with another Piranha Plant soon after, near a ? Block containing a Carrot. Above here is a staircase of books which take Mario up to some coins and a Hidden Block containing a Moneybag. Back down, there is a Koopa Troopa and a few more Goombas around some books, then a ? Block Mario can hit to reveal another 1-Up Heart which is stolen by another collector. In between a Venus Fire Trap and a Piranha Plant in pipes is the Mid-Point Bell.

After the checkpoint are two more Goombas and a ? Block which contains another Fire Flower. There is a Para-Goomba nearby, with coins below over more conveyor belts leading to more spikes. Up ahead are two more Para-Goombas and a few short walls of spikes. Finally, there is the pipe which takes Mario to the battle with the sewer rat.