Buy Individual Puzzles All puzzles are delivered by email, in PUZ and PDF formats (with solution). Puzzle Crossing Over for $1 Puzzle Details This puzzle was published on Jul 30, 2019 by By Elizabeth C. Gorski. Crossing Over for $1 Recipient Recipient Email Address Send as a gift? Gift Options Include a personalized note Send at a later date? Send At Buy Now With Please enable JavaScript to continue.