Murder Mystery Puzzles: How Logic Cases Work

A good murder mystery puzzle hands you every clue and leaves the thinking to you. Here’s what makes one fair, a short case to crack with a step-by-step solution, and practical tips for finding the culprit.

Updated October 22, 2026

What makes a mystery puzzle fair

In a murder mystery puzzle, you’re not just along for the ride. You’re the detective. That only works if the puzzle plays by a few clear rules:

The clues are reliable. In puzzles like the case below, and in Sudocrime, every clue is true: nobody lies, and nothing is a trick. Your job isn’t to doubt a statement but to read it carefully.
Everything you need is on the page. The answer follows from what you can see. No key detail shows up for the first time in the reveal.
There’s exactly one solution. In the end, only one person fits every clue.
You never have to guess. Each step has a reason: this person can only have been here, because …

Motives and old grudges bring a case to life, but in a fair puzzle the facts decide, not suspicion.

A short case: Storm over the Water Lily Inn

It’s a muggy summer evening by the lake. A storm is rolling in over the water, so everyone at the Water Lily Inn, a small family-run guesthouse, stays indoors or out on the terrace. At 9 p.m. the lights flicker. Not long after, Konrad Albers, a longtime regular, is dead. The floor plan will tell you where he was at nine.

Your question: Who was alone with Konrad Albers at 9 p.m.?

The suspects

Ida Lorenz, the innkeeper. For weeks, Albers had been pushing her to sell him the inn.
Bruno Keller, the cook. Albers had panned his cooking in the local paper.
Edith Brenner, a painter who has been staying at the inn for three weeks. Albers had been telling people her new painting was a copy.
Felix Albers, the nephew. He stands to inherit his uncle’s money.

The floor plan

The inn has five areas: the kitchen, the parlor, the library, the sunroom and, outdoors, the terrace. Columns run A to E from the left, rows 1 to 5 from the top. North is up and west is left. Thick lines are walls.

The floor plan before solving. Furniture with a dashed outline is blocked.

The rules

Each row and column holds exactly one person: one of the four suspects or the victim. Every other square stays empty.
Every statement is true and refers to 9 p.m.
Blocked furniture stays empty. Nobody can be on the stove or a plant, not even the victim. Anyone on a chair, the sofa, the armchair or the bench was sitting. Anyone on bare floor was standing.
“Next to” means directly left, right, above or below, in the same room. “West of” means anywhere farther left on the plan, in any row and any room. “South of” means anywhere farther down, in any column and any room.
The square left free belongs to the victim. That’s where the last open row and column meet.
You’re looking for the one suspect in the same room as the victim.

The statements

Ida: “I was sitting out on the terrace, watching the storm come in.”
Bruno: “I was in the library, west of Ida.”
Edith: “I was right next to a plant, sketching.”
Felix: “I was on the phone right next to a plant, south of Bruno.”

Give it a try before you peek. The full solution is below.

Show the solution

Ida was sitting on the terrace, and the only seat out there is the bench on B5. So Ida is on B5, which fills row 5 and column B.
Bruno was in the library and west of Ida, so he’s in column A. The only library squares in column A are A3 and A4.
Felix was south of Bruno. If Bruno were on A4, Felix would need row 5, and Ida already has it. So Bruno is on A3, which fills row 3 and column A.
Felix now has to be below row 3. Row 5 is taken, which leaves row 4. He was right next to a plant: the squares next to the parlor plant are D2 and E1, and the ones next to the sunroom plant are E3, D4 and E5. The only one in row 4 is D4. Felix is on D4.
Edith was right next to a plant, too. Only rows 1 and 2 and columns C and E are still open, so of the squares next to a plant, the only fit is E1.
That leaves row 2 and column C for the victim. Konrad Albers was on C2, in the parlor.
The only other person in the parlor was Edith. Edith Brenner was alone with Konrad Albers.

The solution: Ida B5, Bruno A3, Felix D4, Edith E1, the victim on C2. Only Edith shares a room with the victim.

At first glance, the motive points to Felix, the heir. The statements tell a different story. In a fair mystery puzzle, logic decides, not suspicion.

Grid logic vs. floor plan logic

Most murder mystery logic puzzles come in one of two shapes. Both use the same moves, but they look and feel different.

Aspect	Grid logic	Floor plan logic
What you match	People with places, times, objects or motives	People with squares on a map of the house
Your tool	A grid where you mark every pairing yes or no	The floor plan itself, with rows, columns, rooms and furniture
Typical clue	“The cook wasn’t in the library at nine.”	“I was in the library, west of Ida.”
The answer	Whoever the grid links to the crime	The one suspect in the victim’s room

For a closer look at grids and other types, with a small puzzle to solve, see logic puzzles for adults.

Tips for finding the culprit

Lock in the sure things first. Some clues leave just one option, like the only seat in a room. Each fixed person narrows down everyone else.
Treat alibis as facts. In a fair puzzle, an alibi isn’t an excuse to see through. Ask: if this is true, where exactly could this person have been?
Build a timeline. When a case covers several points in time, a small table helps: who was where, and when? Gaps show you which clue you still need.
Rule out rather than search. It’s often easier to say where someone wasn’t. Cross off squares, rooms or times until only one option is left.
Follow a hunch to the end. When two squares are possible, try one and keep going. If you hit a contradiction, it’s the other. You’ll need this move once in the case above.
Park the clues that point at other people. A clue like “south of Bruno” only helps once Bruno is placed. Note it and come back to it.

From puzzle book to app

If you enjoy murder mystery puzzle books, Sudocrime brings the same idea to your phone, with full stories instead of standalone puzzles. Each chapter is set at a specific time: you read the scene and the suspects’ statements, solve a sudoku and place everyone on the floor plan. The rules are the ones you just used. Every card is true, each row and column holds exactly one person, and the square left free belongs to the victim, or in the practice case, to a missing key.

The practice case, set at a winery, teaches the rules with a small mystery, no murder, and a 4×4 sudoku. “Silence at Lindenrain” is a murder mystery in six chapters with 6×6 sudoku puzzles. Both come with the app, with no ads and no subscription. You’ll find them under cases, and you can play online in your browser with nothing to install. To see how a chapter plays out, read How a murder sudoku works. Every clue type on the plan is explained under floor plan rules.

Frequently asked questions

What is a murder mystery logic puzzle?

A crime story you solve by deduction instead of guesswork. The clues are reliable, everything you need is right in front of you, and only one suspect fits all the facts.

How do you solve a murder mystery puzzle?

Start with the clues that leave only one option, then rule things out. Ask where each person could have been if their statement is true. When two options remain, follow one through. If it leads to a contradiction, the other one is right. Keep going until only one suspect fits.

Are there free murder mystery puzzles?

Yes. The case on this page is free to solve. In Sudocrime, the practice case and “Silence at Lindenrain” cost nothing in the app or in your browser, with no ads and no subscription. Further stories are a one-time purchase of €0.99.