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.
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.
Find the 10 digit number with each digit different and each number formed by first n digits divisible by n. Step by step solution by basic math explained.
In this second 8 balls weight puzzle, find the fake ball in 3 weighs. All 8 balls look alike and you are given a pan balance without any weights.
In this first 8 balls weight puzzle, find the single heavier ball in 2 weighs. All 8 balls look alike and you are given a pan balance with no weights.
3 couples to cross a river in a boat that can carry at most two at a time. Husbands are jealous and no lady will be with a male other than her husband...
3 monkeys and 3 humans are to cross a river in a small boat. The boat can carry at most 2 on a trip. Monkeys will eat up humans if more in number...
Can you solve this tricky river crossing puzzle in 15 minutes? 2 pigs and 2 hens to cross a river in an automated boat that starts automatically. Read on...
Fox goose corn riddle: Farmer to cross river with fox, goose and corn in a boat that takes at most two. Fox eats goose and goose eats corn if left alone.
Move 3 matches to make 2 squares in matchstick puzzle figure. How many solutions can you find? Time to solve 5 minutes. It is a fun puzzle. Give it a try.
