The compost box (
: komposti) is the wooden box at the back of the player's home. It can be used to dispose spoiled food.
There are a few more compost boxes around Kesselinperä. One at the player's home, and two at Toivo's house, behind the outbuilding.
The compost box at the house of the player is the center of the world, placed in 0, 4, 0 coordinate.