In word sudou, you must fill in each row, column or 3x3 block using the letters of a word, instead of numbers. Otherwise, normal sudoku rules apply: all letters of a 9-letter word must be used, without repetitions in rows, columns or blocks.The main benefit of word sudoku, compared to normal sudoku, is that it activates more parts of the brain at the same time: verbal skills, memory, logical reasoning and counting brain regions are all stimulated simultaneously.This makes the game an excellent way to train your mind and keep it active and healthy Remember how the first time you played regular sudoku, you found the game intense and challenging? As it felt like a full-blown brain workout?Sadly, that feeling goes away gradually over time in most players, as they get better at sudoku.That's because as our brains learn how to solve a problem, they become much more efficient at it, and start using only a small fraction of our brain capacity to solve it.