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 Will 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****Number lock 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**

**Can You Solve the PROBLEMSOLVING Repetition Riddle?**

**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**

**Connect the nine dots riddle: step by step solution**

**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**

**Sharpen Your Thinking: Solve Day Before Two Days After Riddle**

**Matching Socks Puzzle: Pick Minimum Number of Socks**

**Four Persons Bridge and Torch River Crossing in 15 minutes Puzzle**

**4 digit number lock riddle 2657: Can you crack the code?**

**4 digit number lock puzzle 9285: Can you crack the code?**

### 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**

**Math Olympiad Question: Can You Solve in 5 minutes?**

**Cracking the Code: Solving the Changing Length Repetition Riddle**

**Prism of Cubes with Least Number of Exposed Faces Puzzle**

**Will of the Eccentric Millionaire in Fractions of Remainders**

**Calendar Math Puzzle: What Day is Duorp's 25th Urp Birthday?**

**The Thrifty Shop-owner Coin Collection Division Puzzle**

**How many two digit consecutive integer sets have sum 100**

**A Zinger Packaging Box Puzzle: How Many Possible Combinations?**

**Can You Solve the Twin Birth Statistics Puzzle**

### 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**

**Can You Solve the Tricky 3-letter Words Logic Puzzle? (3 Clues)**

**Sharpen Your Logic: Exercise Your Brain with These Fun Puzzles**

**Can you Crack the Lying and Truth-telling Lion and Unicorn Puzzle**

**Solutions to a Liar, Truth-teller Puzzle: Many Ways of Reasoning**

### Number lock puzzles

**Open the Lock Riddle with 682 in Clues**

**Open the lock riddle with 154 in clues**

**Number lock puzzle: Can you crack the code?**

**4 digit number lock riddle: Can you crack the code**

**4 digit number lock riddle 2657: Can you crack the code?**

**4 digit number lock puzzle 9285: Can you crack the code?**

**3 digit number lock puzzle with 3 clues: Crack the code**

**Can You Solve the Number Lock Puzzle with 5 Clues including 682?**

### 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**

**Four friends river crossing puzzle in a 100 kg capacity boat**

### 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**