You’ve been hired to examine a warehouse that’s rumored to be haunted. You test a bunch of different locations with your meter, and yes, there are definitely ghosts here. But before you can call in the exorcism team, you need to mark the exact locations.

Oh no! The creatures in the grid have hidden all the numbers of this Sudoku puzzle! Fortunately, you still have some clues.

Today you find yourself trapped in a haunted castle. You know there are monsters here, and even how many, but where are they? You can look into this room from any position, but can you figure it out?

Everyone loves candy, so you picked up a box as a gift. The problem is, they only want a specific set of pieces, and none of them can touch each other, even diagonally. Can you figure out what you need to remove, leaving only the candy that fits their preference?

One eager ghost is really looking forward to trick-or-treating, and is already planning a route through the neighborhood. Can you find a route that circles the entire neighborhood, visiting every house one time?