This is a rather long list of challenging brain teasers with solutions. The brain teasers are hand-picked and solutions focus on systematic problem solving.
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Puzzles and Riddles That You may Find Interesting
It is a growing list of puzzles and riddles that I felt attracted to and solved. The puzzles belong to all major categories. Each puzzle is divided into two parts - the puzzle and its solution.
A solution focuses on each little step of thought that leads to the solution. And it relies heavily on problem solving strategies and techniques as well as reasoning. Reasoning is my favorite topic - there is so many types and forms of reasoning!
Problem solving techniques are merrily used. But these days, that is during last part of 2021, I favor Question, answer and analysis technique to crack many hard nuts.
Enough of monologue. Go ahead. Taste for yourself. Who is not fond of challenging brain teasers!
Quick jump links to the categories are,
- Riddles
- Mathematical puzzles
- Logic puzzles
- River crossing puzzles
- Ball weighing puzzles
- Matchstick puzzles.
Just click on any of the above links to go through the particular category chosen and to return click on your browser back button.
Riddles
These are the puzzles that I couldn't categorize comfortably. Usually a riddle is small having a small number of key mysteries to unravel. But you will find some of the riddles not easy to conquer.
Riddle of 4 persons crossing a bridge over a river at night
Riddle of PROBLEMSOLVING - Creation and application of Repetition pattern based technique
Airplane riddle of flying around the world
Riddle of lying and truth-telling twins
Two jugs riddle of delivering 1 quart of milk each
How could Sonia sell half a poodle riddle
Transfer a pile of 15 numbered discs riddle
Two burning ropes timer riddle
Devotee and three temples riddle
Big game hunting riddle: How many animals were bagged?
Knight and calculator keypad riddle
Riddle of all around handshakes in a dinner party
Open the lock riddle with 682 in clues
Connect the nine dots riddle: step by step solution
Open the lock riddle with 154 in clues
Number lock puzzle: Can you crack the code?
Two circles and a line riddle: can you traverse?
The ten barrel face number puzzle
Stepping stone crossing riddle step by step solution
Odd numbered and even numbered piles riddle
Catch the cat hiding in 5 boxes riddle
4 digit number lock riddle: Can you crack the code
Remove discs from 10 touching discs riddle
Mathematical puzzles
Each of these puzzles is predominantly math heavy. Some amount of math you would surely need to solve a puzzle of this category.
But I have taken special care to keep the math simple (simply because I don't know complex math). Even such a hard one like Monkey and coconuts I have solved using Class ten level math that should be understood by most if not all.
Reverse cheque puzzle solution
Counting eggs puzzles based on Euclid's division lemma
Monkey and the coconuts puzzle with solutions
10 digit Conway number puzzle with solution
World's Hardest Easy Geometry Puzzle Solved with Techniques Explained Step by Step
Hard Algebra Puzzles Solved by Basic Exponent Concepts and Reasoning
Three squares in a triangle puzzle
9 squares in a rectangle math puzzle
How many addition signs needed to make sum of 99
Solve 3 puzzles by solving only one: Domain mapping
Minimum number of heads with same number of hairs riddle
Sharing a bicycle puzzle step by step solution
Ship carpenter's problem of plugging a square hole puzzle
Half and half money math puzzle
What is the weight of the fish?
The cat and mouse game with advisor dog
The puzzle of a purchase in the local market
Logic puzzles
Just like math puzzles, these are logic heavy. I mean heavily dependent on formal logic that involves truth, falsity, implications and so on.
Though logic is a part of math only, in puzzles, logic demands a separate category. These are especially interesting.
Method based solution to Einstein's logic analysis puzzle, whose fish
How to solve Einstein's puzzle whose fish confidently, improved method based solution
Logic puzzle, When is Cheryl's birthday
Liar and truth-teller riddle with step by step easy solution
Liar, Truth-teller, Random-answerer riddle
Flipping coins to heads or tails logic puzzle
Six wrong labeled bottles logic puzzle
Riddle of Name of the Engineer
Who wears which shirt color logic puzzle
Whose birthday on which day logic puzzle
4 logicians and 11 fish fries logic puzzle
River crossing puzzles
This category has a small number of puzzles but these are highly popular and engaging ones.
Farmer with fox, goose and bag of corn crossing the river puzzle
Two pigs and two hens crossing river puzzle
3 monkeys and 3 humans crossing river puzzle
King queen minister washerman river crossing puzzle
Ball weighing puzzles
This is also a small category with only a few puzzles. But again these are of a kind as the saying goes.
None of these are easy to solve, but again not too hard to understand the solution also.
Find the heavier among 8 identical balls in 2 weighing puzzle
Find the fake ball among 8 identical balls in 3 weighing puzzle
Find the fake ball among 9 identical balls in 3 weighing puzzle
Find the fake ball among 12 identical balls in 3 weighing hard puzzle with solution
Matchstick puzzles
This is my favorite category and I always keep a large box of matchsticks within reach to play with when I feel the need.
It is a wonder how many engaging creations can be made with these innocuous little sticks!
Solution to 6 triangles to 5 triangles in 2 moves, first matchstick puzzle
Matchstick puzzle 5 squares to 4 squares in 2 moves
Matchstick puzzle 5 squares to 4 squares in 3 moves
Matchstick puzzle, Turn around the fish in 3 moves
Fifth Matchstick puzzle, Move 3 sticks in tic-tac-toe figure to form 3 perfect squares
Hexagonal wheel to 3 triangles by removing 4 sticks
Convert 5 squares to 4 squares in 3 stick moves, third 5 square matchstick puzzle
Matchstick Puzzle - Make the kite nose-dive in 5 stick moves
Make 5 squares from 6 in 2 stick moves - 6 square matchstick puzzle
Move 3 sticks and convert 5 squares to 4 squares in 4th 5 square matchstick puzzle
Move 3 sticks and convert 4 squares to 3 squares matchstick puzzle
Move 8 sticks and convert 5 squares to 2 squares matchstick puzzle
First Move 3 sticks and make 2 squares matchstick puzzle
Second Move 3 sticks and make 2 squares matchstick puzzle
Remove 2 matchsticks to leave 6 triangles puzzle
Add 3 matchsticks to make 4 triangles - lateral thinking stick puzzle
Move 1 stick to make 4 closed shapes each with 3 or 4 sides
Move 2 sticks to make 5 closed shapes matchstick puzzle
Move 2 to make 7 squares matchstick puzzle - solution based on problem solving and innovation model
Move 4 to turn the tower upside down Matchstick puzzle
Move 2 matches to make 6 squares and move 8 matches to make 6 squares - a pair of matchstick puzzles
Move 6 matches to make 5 squares
Move 2 matches and add 1 to make 2 diamonds puzzle
Move 4 matches to make 5 triangles matchstick puzzle
Remove 4 matches to leave 4 equal triangles puzzle
Transfer 1 match in two matchstick groups puzzle
Move 3 matches to make 5 equal squares puzzle
Matchstick puzzle move 4 to make 10 squares
Matchstick puzzle Move 2 for form 11 squares
Move 2 matches to make 3 triangles
Remove 3 matches to leave 3 triangles
Move 3 matches to make 7 squares matchstick puzzle
Move 4 to make 6 squares matchstick puzzle
Move 4 matches to form 3 square area
Move 4 matches to make 4 squares matchstick puzzle
Move 2 matches to form 4 equal squares matchstick puzzle
Move 3 matches to create 3 squares of different sizes
Matchstick star puzzle - Move 2 matches to form 6 triangles
Move 2 matches to form 5 triangles from 6 triangles puzzle
Remove 3 and move 2 matches to form 3 squares puzzle
Enclose maximum number of triangles by 9 matchsticks
Remove 4 matches to leave 6 diamonds matchstick puzzle
Turn around the face of the pig in 2 moves puzzle
Add 10 matches to create 5 diamonds matchstick puzzle
Move 3 matches of 6 squares to create 5 squares puzzle
Turn the Westerly fish to Southerly swimming fish in 2 moves
Remove 5 matches to leave 5 squares matchstick puzzle
Move 4 matches to make 6 triangles matchstick puzzle
Remove 6 matches to leave exactly 2 squares puzzle
Move 3 matches to form 6 squares matchstick puzzle
Move 3 Matches to Form Exactly 3 Rectangles Puzzle
Move 4 matches to leave 2 triangles matchstick puzzle
Move 3 sticks to form six squares matchstick puzzle
Move 3 matches to form 2 large and 1 small triangle puzzle