“Death at the Campsite” is a Murdoku case from the Campground category: a board of 6×6, 5 suspects and one victim. Read the clues, work out where everybody was standing, and name the suspect who was left alone with the body.
The grid is 6×6, rated Easy. All 6 people — the 5 suspects and the victim — stand in a row of their own and a column of their own, so every line of the board holds exactly one person and no two of them ever share one. Most of the reasoning in this case runs off that single constraint.
The floor plan is cut into 15 rooms: Forest, Clearing, Lake, Campsite 1, Campsite 2, Campfire, Picnic Area, Jetty, Playground, Parking Lot, Restroom, Showers, Kiosk, Reception, Cabin. Rooms are what the clues talk about — who shared one, who was next door, which one stood empty — so the shape of the plan is half the puzzle.
Part of the plan is open air: Forest, Clearing, Lake, Campsite 1, Campsite 2, Campfire, Picnic Area, Jetty, Playground, Parking Lot. That matters, because the clues that separate indoors from outdoors put those areas on the far side of the line.
5 suspects, one of whom is the murderer — the one the victim was left alone with. They are told apart by how they look and where they can have been: hair, beards, glasses, and the rooms the clues rule in or out. The victim shows only their gender, and that is deliberate: a clue hanging on something you cannot see would not be a clue you could follow.
This case hands you 5 clues and nothing else. None of them is decoration — each one has been checked to be needed, so a clue you have read and not yet used is a clue you are not finished with.
1 of them speak about the whole board rather than about one person: how many rooms stood empty, say, or how the suspects are spread across the plan.
Like every case in the casebook, this one has been machine-checked to have exactly one solution, and to be reachable by forward deduction alone. There is never a point where the only way on is to try an arrangement and see whether it collapses.