6 detective riddles with answers, plus 4 bonus puzzles
Start with six short detective riddles, then try four illustrated puzzles if you fancy a longer challenge. Each riddle has a hint and a hidden answer, so you can have a guess before revealing the explanation.
The riddles ask you to spot a missing detail or a different meaning. The illustrated puzzles give you clues to work through, with extra hints and an answer checker on their own pages.
Part one: six detective riddles
Read each setup carefully. These are lateral-thinking riddles: the answer offers an explanation that fits the story, rather than proving a culprit from a full set of evidence.
1. The wife, the water and the rope
A woman shoots her husband, holds him underwater for five minutes, then hangs him. An hour later they go out for dinner together. How?
Show clue
Every verb here has a second meaning inside one particular hobby.
Show answer
She is a photographer. She shot a photo of him, held the print underwater in the developing bath, then hung it up to dry.
2. Five glasses of water
James and a friend are served water from the same jug, with ice from the same tray. His friend drinks five glasses quickly and leaves. James sips one glass over the next hour and dies of poisoning. The water in the jug is clean. Where was the poison?
Show clue
The poison was in the glass, and it was not in the water when it was poured.
Show answer
The ice. The poison was frozen into the cubes. James drank slowly enough for his ice to melt, while his friend finished the drinks while the cubes were still frozen.
3. The painting in the vault
A valuable painting is stored in a vault. After a visit from someone with access, its owner finds a plain black canvas in its place. The original canvas has never left the vault. How could the picture have disappeared?
Show clue
The visitor added something to the canvas.
Show answer
It was painted over. A layer of black paint covered the picture. The original was still there, hidden underneath.
4. The unbroken window
A shopkeeper hears a crash and finds glass scattered across the floor beneath a window. The window is closed and unbroken. Nothing has come through it, and nobody has entered. What broke?
Show clue
Something else made of glass had been sitting near the window.
Show answer
One possible answer is a glass vase. It fell from the windowsill. Another glass object could also fit: the useful observation is that the window itself never broke.
5. Light with the lights off
A man is working late in his office. Although the electric lights are off, an orange glow lights the room. It grows brighter as smoke comes under the door. What is lighting the office?
Show clue
The glow and the smoke come from the same source.
Show answer
A fire. The flames are producing the glow, and the smoke is the warning that the light is coming from a fire nearby.
6. The missing weapon
A detective finds a man who has been stabbed. Beside him is a puddle of water, but no weapon. The weapon was left there, and nobody has touched the scene. What could it have been made of?
Show clue
Think about the temperature of the room, and what a weapon could be made of.
Show answer
An icicle. In the riddle's explanation, it was used as the weapon and melted before anyone arrived. The puddle is what remains.
Part two: four puzzles from our archive
For these four, you'll need to study the image and work out how its clues fit together. Open a puzzle in the archive to zoom in, get another hint, or check your answer.
7. Jungle Pet, ✦ introductory
The vibrations of the transport helicopter fade into the distance. Your special operations team stays low, weapons drawn, surveying the island's jungle surroundings and securing the area. You move quickly and quietly to the main laboratory. The interior is in shambles, as if an intense struggle ensued. In the center of the room is a shattered case with a massive, cracked egg. These billionaires and their insane pet projects… what in the world were they studying??
Examine the image carefully. What creature awaits?
Show the first hint
Zoom in on the image. Do you notice any elements in the image that stand out? The solution to the puzzle is a single word. Is there anything that could be translated to a word that would illuminate what happened here?
Solve Jungle Pet in the archive.
8. Rendezvous, ✦ introductory
A pigeon taps softly at your window… this is it: a new life, a new world, freedom. You quickly move to open the window and retrieve the note secured to its leg. Your meeting place is set, but when? The timing of your escape needs to be perfectly synchronized. You sit down to read…
A pigeon delivers this coded message. When should you meet?
Show the first hint
Read through the entirety of the poem. Do any of the lines provide hints about how you might be able to decode a time?
Solve Rendezvous in the archive.
9. The Guardians, ✦✦ intermediate
The pair of knights stand before you in pristine armor, Sir Lawrence in silver, and Sir Phillip in Green. They stand silently, but each holds a scroll with elegant script. You've heard of this test from lore… each scroll holds either only truth, or only lies. They could both be holding truths, both be lying, or there could be one of each. You must determine each of the knights' types - truth or liar - and then decipher the hidden passcode.
Sir Lawrence (silver armor) and Sir Phillip (green armor) each hold a scroll with clues
Show the first hint
Begin by determining each knight's "type": truth-teller or liar. They both state that the other lies. From this, can you determine if they are both liars, both truth-tellers, or one of each?
Solve The Guardians in the archive.
10. Train Treason, ✦✦ intermediate
You arrive at the station just as the train suspected of carrying the KGB agent pulls in. Scores of men and women pour off and begin to make their way to the exit. Your espionage instincts are unfortunately not identifying any standout candidates as the operative. Whatever was supposed to be handed off is of grave import to the Moscow Kremlin. Your only hope is to decode the note found on the now captured American mole - quickly!
The coded note found on the captured mole
Show the first hint
Do you notice anything about each of the sets of words ("rocky chamber", "not dumb", etc.)? What might these encode?
Solve Train Treason in the archive.
Choose another free puzzle
The Puzzle Archive has fifteen puzzles, graded from introductory to expert. Each runs in the browser with optional hints and an answer checker. If you enjoyed the four above, choose the difficulty you fancy and try another.
For solving on paper, ten archive puzzles also have printable versions.
If you want a whole evening of this
If you enjoyed decoding the notes above, you might like a case that unfolds across a whole table. In a boxed game, a clue in one document can help you make sense of another, and the story moves forward as you solve.
In Blackbrim: 1876, you follow the clues left by a criminal who has kidnapped a town's police force. You can play solo or with up to six people, and the two-part case takes 2 to 4+ hours. It's recommended for ages 14+, with optional hints whenever you need a nudge.
If you would like to compare the whole category first, our rundown of eleven mystery box games lists playtimes, player counts and what you actually do in each one.
Take a look inside Blackbrim: 1876 to see the materials you'll be working with. If you'd like more free puzzles first, choose your next one from the archive.
Questions about detective riddles
What is the hardest detective riddle?
That depends on which assumptions you make when reading them. Try the six short riddles without opening the hints, then move to The Guardians or Train Treason for a challenge that involves working through several clues.
Are these riddles suitable for kids?
Several of the short riddles involve death or poisoning, so read them first before sharing them with children. The illustrated puzzles vary in theme and difficulty too; choose one whose story and clues suit the child you have in mind.
What is the difference between a riddle and a puzzle?
A riddle usually asks a short question whose answer depends on wordplay or an unexpected interpretation. A puzzle may involve several steps, such as decoding a message and using it to solve another clue. The examples here let you try both.
Where can I find free puzzles like the ones in your games?
Our puzzle archive holds fifteen free puzzles that run in the browser, graded from introductory to expert, each with a story, staged hints and an answer checker. There is no signup and nothing to download. Jungle Pet is the usual starting point and Bombs Away is the one that combines the earlier techniques.
How do you solve a knights and knaves puzzle?
Try each possible combination of truth-tellers and liars, and check every statement against it. Discard any combination that creates a contradiction. In The Guardians, you'll use what you learn about the knights to work out a passcode.
