New posts in Puzzle

Difficult coin weighing puzzle: 14 coins, 1 fake (heavier or lighter), 3 pre-determined weighings

Verification of a solution to a mathematical logic problem

What are some puzzles that are solved by using invariants?

Ratio of area covered by four equilateral triangles in a rectangle

Dividing a circular field in 4 equal parts by putting 3 equal straight fences

Does Ball Sort Puzzle always have a solution?

Knights $3\times 3$ riddle

Erase every other number from $1, 2, 3, ... 2000$ until only one number left

How to construct an equilateral triangle on 2 concentric circles

Determine hollow marble with least number of weighings