In the village, the door on the far left is locked, despite me completely beating the game in terms of levels and inventory. How can I open that locked door? The last 2 things I need to do is open this door and beat the arcade games.
I'm sorry, but on the wiki, there is no "fourth house" in the village that you can enter. There is a locked house, but according to this line in the wiki about the village: Each of these areas can be accessed except for the first locked house So, you cannot unlock it.