For each one, first the puzzle is posed for you to solve within a recommended time. A detailed systematic solution then follows.
Matchstick puzzles, riddles, math puzzles, logic puzzles, river crossing puzzles, ball weighing puzzles are some of the categories.
The full list of all brain teasers with solutions is available in the link,
Challenging brain teasers with solutions: Long list.
This will always be the most up-to-date list with the brain teasers classified into categories that can be browsed separately.
12 balls weigh 3 times to find the one fake. All 12 balls look same and you have a pan balance with no weights. Time to solve the 12 balls puzzle 40 mins.
Learn how to decode and discover the hidden clue in a conversation through step by step reasoning, applying question, analysis and answer technique.
Find the fake ball among 9 balls in 3 weighs. All balls look alike. You have a pan balance with no weights. Time to solve is 30 minutes.
Measure 4 liter of water with two empty jugs of 5 liter and 3 liter capacity and a tank full of water. Fill and pour as many times as you need.
Move 2 matches to form 5 matchstick shapes of squares, triangles or rhombuses. How many such new figures can you make? Total recommended time 10 minutes.
Move 1 stick to make 4 matchstick shapes of triangles, squares or rhombuses. How many such new figures can you make? Recommended time 10 minutes.
How to make 4 triangles with 6 sticks! Add 3 matches to the single matchstick triangle and make 4 triangles with 6 sticks. Time to solve 5 minutes. Can you?
Two Exponent and base puzzles: Both exponent and base of the term in LHS are quadratic equations in single variable and it equals 1. Time to solve 15 mins.
World's hardest easy geometry problem is to be solved by elementary geometry only and that makes it hard. Hint: Increase symmetry in the puzzle figure.
In this matchstick triangle puzzle you have to remove 2 matchsticks to reduce number of triangles from 8 to 6. How many ways can you do it? Time 30 mins.
