100+ Brainteasers with answers for kids and adults

Brainteasers with Answers - "Challenge your brain and improve your problem-solving skills with our collection of brainteasers. From logic puzzles to wordplay, our brainteasers will keep you entertained and engaged for hours. Whether you're a student looking to boost your grades or an adult looking to keep your mind sharp, our brainteasers have something for everyone. Test your mental aptitude and see just how clever you are with our challenging and fun collection of brainteasers."

Updated: 02-01-2026

The Two Door Puzzle-Brain teaser

61. Riddles
You are standing in front of two doors. One leads to freedom, and the other leads to death. Two guards are standing, one in front of each door. One always tells the truth, and the other always lies, but you don't know which one is which. You can ask only one question to one of the guards to figure out which door leads to freedom. What do you ask?

    • Ask either guard, "If I were to ask the other guard which door leads to freedom, what would they say?" Then, choose the opposite door.

Guess next 3 letters- Brain Teasers

63. Riddles
Guess the next three letters in the series GTNTL.
    • Answer: I, T, S. The complete sequence is the first letter of every word in the sentence.

What letter comes next-Brain Teasers

66. Riddles
What letter comes next in the following sequence. D R M F S L T_
    • Answer: D, each letter represents one note in the diatonic musical scale: Do, Re, Mi, Fa, Sol, La, Ti, Do

leep the least-Brain Teasers

67. Riddles
During which month do people sleep the least?
    • Answer: February (there are usually fewer nights in February).

Two boxers are in a match scheduled for 12 round-Brain Teasers

68. Riddles
Two boxers are in a match scheduled for 12 rounds. (Pure boxing only - no kicking, UFC takedowns, or anything else). One of the boxers gets knocked out after only six rounds, yet no man throws a punch. How is this possible?
    • Answer: Both boxers are female.

The Apple Distribution-Brain teaser

73. Riddles
You have 7 apples. You need to distribute them among 7 people in such a way that each person gets 1 apple, but one apple must remain in the basket. How do you do it?

    • Give 1 apple to each of the first 6 people, and give the 7th apple along with the basket to the last person. This way, everyone gets an apple, and one apple remains in the basket.

The Hourglass Puzzle-Brain teaser

74. Riddles
You have two hourglasses: one measures 7 minutes and the other measures 4 minutes. How can you measure exactly 9 minutes?

    • 1. Start both hourglasses at the same time.
2. When the 4-minute hourglass runs out, flip it immediately.
3. When the 7-minute hourglass runs out, flip it immediately.
4. When the 4-minute hourglass runs out again (at 8 minutes), there is 1 minute of sand left in the 7-minute hourglass.
5. Let that 1 minute pass. You're now measured exactly 9 minutes.

Which exit do you pick- Brain Teasers

75. Riddles
You're escaping a labyrinth and there are three exits. Exit A leads to an inferno. Exit B leads to an assassin. Exit C leads to a lion that hasn't eaten in 3 years. Which exit do you pick? 
    • Answer: Exit C. If a lion hasn't eaten in 3 years, it has definitely starved to death.