Monster Manor

Monster Manor (known in Japan, Britain, and Australia as StreetPass Mansion) is a DLC game for StreetPass Mii Plaza. It was developed by Prope.

Plot
In Monster Manor, the chosen Mii is an investigator trying to solve the mystery of a haunted house by getting to the 30th floor, with the help of their partner, Iris Archwell, as well as the other investigators inside. The player explores numerous floors and battles numerous monsters along the way. However, there is a catch, as most of the rooms in the mansion are hidden and can only be reveiled by setting down map peices provided by the other investigators. Finding the stairs in each floor is also the only way to progress to the next one. There are also bosses on certain floors that guard the stairs, and the player will not be able to get to the next floor until that boss is defeated.

After reaching the top floor, the player encounters Arzodius, the Demon King. Iris tells the player that the manor used to belong to a scientist whos daughter got sick and passed away. The scientist made a deal with some ghosts to revive his daughter in exchange for a passage into the world, but Arzodius possesed the scientist and took over.

After defeating Arzodius, the manor is restored to normal and Iris Archwall tells the player their records in the game. The credits will then roll not long afterwards. Successfully clearing the game will award the player with the Demon King hat.