In Liar, Truth-teller, Random-Answerer Riddle, a traveler can ask two questions to decide which is the safe path out of two. What to ask?
In liar and truth-teller riddle, to know the safe path, a traveler can ask only one question to any one of a habitual liar or a truth-teller. What to ask?
The 7 squares matchstick puzzle: Move 2 matches to make 7 squares in the puzzle figure. Time 10 mins. Apply reasoning based on matchstick puzzle concepts.
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.
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.
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?
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.
