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.
Join the nine dots in a 3-by-3 grid by 4 straight lines without raising the pencil. Solve in 30 mins. Learn how to solve the tough puzzle from the solution.
Add 9 matches to make 8 nodes in the puzzle figure of a triangle of 3 nodes made up of 3 matchsticks. Time to solve: 5 minutes. Try applying reason.
Can you find the three-digit code to open the number lock? You have five clues each based on a code combination. Time to solve the riddle, 10 minutes.
In matchstick figure, remove 3 matches and leave 3 triangles. You have 10 minutes to solve the puzzle. Try and then learn how to solve from solution.
In puzzle figure, move 2 matches to make 3 triangles with no match unattached to any triangle. Solve in 5 minutes. Learn how to solve easily from solution.
Move 2 to form 11 squares is a tricky matchstick puzzle to solve in 5 minutes. Give it a try and then learn problem solving in puzzles from the solution.
Change money math puzzle: Find three money amounts all made up of same three digits and sum of two amounts equal to the third amount. Time to solve 15 mins.
Solve matchstick puzzle move 4 to make 10 squares in 5 mins. Each matchstick must be attached to a square in the solution figure. Think systematically.
12 guests in a dinner party, 4 couples and 4 persons without spouses, shake hands with each other except their spouses. How many handshakes were there?
Knight and Calculator Keypad Riddle: Find valid 10 digit numbers by the knight moves on calculator keypad. Visit every digit once only. Solve in 15 mins.
