Apart from the obvious negative aspect of getting addicted to them to such an extent
that you start neglecting the rest of your life, puzzles keep your brian active and sharp.
For this site, I have written some programs that generate a number of puzzles so that there is a
fresh, never-been-published-before one every day that you can download and solve for free. You don't need to have an account or log-in and
you don't need to pay anything. You will need to print the puzzle out or copy it down (good luck with the
Kakuro puzzles there) but apart from that, there is no cost. You can buy books from Amazon of 250 Uber- Ultra- and Hyper-Gogen
puzzles for yourself or a gift for somebody who is into puzzles - just go to the Gogen
Books page for detais.
Briefly, you will find Sudoku puzzles and if
you want to make it a bit harder, there are some that use a writing system for the numbers that most people are not
familiar with so looking at a 3x3 square or a row or column, a missing number will not automatically jump out at you.
In additon, there are two Kakuro puzzles published each day, one
from the easier end of the spectrum and one from the harder end. During te course of the week, the kakuro puzzles get larger and more involved, starting on a Monday until on a Sunday, you have the biggest, like so...