You start the game like normal, but on the first day you need to find a campfire with smoke coming from it.

Go to the basement, take the bucket filled with water and go use it on the campfire. The sun disappears.

Then play the game like normal, but you have to play the labyrinth dream, get to the end and eat the cake.

On the third day, you can walk through the woods of one of the corners of the map (the one where the rabbits were).