Mass. Action

by George Barany and Robert Hammer

This "mid-week level" puzzle (17x17), released in March 2013, celebrates biotechnology and has commercial overtones (spoiler) that you can learn about by clicking here.

Click here to view or download the puzzle in PDF format; here to download it as a puz file; here to download it as an ipuz file [requires the free Puzzazz app to solve]; here to solve the puzzle interactively (thanks to Jim Horne); here for the solution. The puzzle was beta tested by our usual group, and the photograph to the right is by Alicia Thibeault.

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More puzzles here (all), here (science), and here (tributes).

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