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Use strategies like the 'line & cube' and the 'line count' to SCREAM through easy puzzles in under 10 minutes. And the unique 'slide rule' to produce numbers seemingly out of thin air. And for very hard or diabolical puzzles, I've included little known strategies for producing results.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.