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...Liberty’s sales back up the idea that puzzles are popular again. Liberty has grown considerably every year since it opened up shop. Lately, though, its puzzles have been so popular it’s “overwhelming,” says Wirth. But when we asked him how many puzzles the company sells each year, he declined to reveal anything. “We’ve been the victim of corporate espionage,” he says. Like people scouting out its Boulder, Colorado factory operations and stealing precious information. Who knew puzzle intelligence operatives were a thing? more