Puzzleprime Difficulty Advanced
🔥 Riddle • Advanced
Freezes When Overheated
What freezes when it is overheated?
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🔥 Mathematics • Advanced
Beautiful Tapestry
A piece of a beautiful tapestry is missing. Can you figure out what its colors are?
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🔥 Deduction • Advanced
Murder Mystery Puzzles
In the three murder cases below, you can read the testimonies of all suspects. For each case, find who the killer is, knowing that no 2 people are in the same row or column, and that the killer was alone in a room with the victim.
EASY
MEDIUM
HARD
EASY
MEDIUM
HARD
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🔥 Mathematics • Advanced
Self-Describing Number
Find all 10-digit numbers with the following property:
the first digit shows the number of 0s in the number
the second digit shows the number of 1s in the number
the third digit shows the number of 2s in the number, and so on
the first digit shows the number of 0s in the number
the second digit shows the number of 1s in the number
the third digit shows the number of 2s in the number, and so on
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🔥 Practical • Advanced
Square Impossible
Take a square (or circle) coaster. Then, cut a hole in a piece of paper with the shape of a square, so that the side of that square is half of the side (or the diameter) of the coaster. Now, your goal is to push the coaster through the hole without tearing the paper (you can fold it).
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🔥 Hidden Objects • Advanced
Awkward Hidden Objects
Warning: this puzzle involves mature themes that are inappropriate for younger audiences. If you are not an adult, please skip this puzzle.
SHOW PUZZLE
SHOW PUZZLE
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🔥 Deduction • Advanced
Cheryl’s Birthday
Cheryl’s birthday is one of 10 possible dates:
May 15
May 16
May 19
June 17
June 18
July 14
July 16
August 14
August 15
August 17
Cheryl tells the month to Albert and the day to Bernard.
Albert: I don’t know the birthday, but I know Bernard doesn’t know either.
Bernard: I didn’t know at first, but now I do know.
Albert: Now I also know Cheryl’s birthday.
When is Cheryl’s birthday?
May 15
May 16
May 19
June 17
June 18
July 14
July 16
August 14
August 15
August 17
Cheryl tells the month to Albert and the day to Bernard.
Albert: I don’t know the birthday, but I know Bernard doesn’t know either.
Bernard: I didn’t know at first, but now I do know.
Albert: Now I also know Cheryl’s birthday.
When is Cheryl’s birthday?
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🔥 Insight • Advanced
Perfect Day
Dear Diary,
This morning, I woke up at 9 o’clock. My first job was to drink a glass of water and brush my teeth. After that, I ate an apple, 2 bananas, and a toast with almond butter for breakfast. Then, I went to the gym for one hour, took a shower, and came back home at eleven. I cooked a few pieces of chicken with sweet potatoes for lunch; ate everything. In the afternoon, I started working on my projects while listening to classical music. In the evening, I went for the 2nd time to the gym, did cardio for half-an-hour, and after that visited my friend’s apartment. We had together one big pizza for dinner and in the end, I fell asleep on his couch.
As you can see, my entire day was perfect, except that my laptop keyboard broke. Can you figure out what’s wrong with it?
This morning, I woke up at 9 o’clock. My first job was to drink a glass of water and brush my teeth. After that, I ate an apple, 2 bananas, and a toast with almond butter for breakfast. Then, I went to the gym for one hour, took a shower, and came back home at eleven. I cooked a few pieces of chicken with sweet potatoes for lunch; ate everything. In the afternoon, I started working on my projects while listening to classical music. In the evening, I went for the 2nd time to the gym, did cardio for half-an-hour, and after that visited my friend’s apartment. We had together one big pizza for dinner and in the end, I fell asleep on his couch.
As you can see, my entire day was perfect, except that my laptop keyboard broke. Can you figure out what’s wrong with it?
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🔥 Lateral • Advanced
A Lady and a Cowboy
A lady and a cowboy lie next to a bullet, a dime, and a hook. As a result, someone is delighted but doesn’t show it. What are they doing?
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🔥 Mathematics • Advanced
Monochrome Isosceles Triangle
All points on a circle are colored in blue and red colors. Show that you can inscribe inside the circle an isosceles triangle whose vertices have the same color.
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