What is Kakuro puzzle?

Kakuro puzzles are regular features in many math-and-logic puzzle publications across the world. The objective of the puzzle is to insert a digit from 1 t...

Does Sudoku help in chess?

Any two cells separated by a knight’s move or a king’s move (in chess) cannot contain the same digit. Any two orthogonally adjacent cells cannot contain c...

How does the 5 card trick work?

When your hand reaches five cards without going over 21 you have a Five Card Trick, and you are not allowed any more cards. At any time when your total ha...