To play Numbrix, you must fill in all of the blanks with consecutive numbers between one and 81. The only rule is that the numbers must be along the vertical and horizontal axis, not the diagonal.

Image courtesy of Parade magazine

Ira Bornstein figured he would never have to search for another puzzle to entertain and engage his mind. For years, Bornstein, who is chief operating officer at Florida-based American Bancard LLC, a company that provides merchants with credit and debit card processing services, was a devotee of the wildly popular game, Sudoku. But then in 2008, Bornstein was flipping through the pages of Parade magazine and came across its weekly numbers and logic puzzler called Numbrix [source: Bornstein].

Ever since, Bornstein has been so hooked on Numbrix that "my wife tells me I'm nuts all the time," he says. For Bornstein, the reasons Numbrix is fun, challenging and extremely satisfying are many. For one thing, Bornstein equates playing the puzzle to being in a maze -- in a good way. "As long as the path I choose always has a way in and a way out, I can keep moving," he says.

Interestingly, Bornstein also is attracted to Numbrix because each puzzle is unique and each provides him with the sort of sense of accomplishment that can be elusive in the day-to-day activities of his job. "In a business setting, there are ongoing issues to resolve and many never come to 100 percent resolution," he says. "In Numbrix, the challenge is front and center and whether it's a success, or the rare instance the puzzle wins, it's complete in less than 10 minutes."

Click ahead to find out how and where to play Numbrix.