If you've played SpaceChem, Infinifactory, Opus Magnum, or any of the other engineering puzzles of Zachtronics ... DOS decided to give the game away for free instead. "This decision is not a ...

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An illustration of a magnifying glass. An illustration of a magnifying glass.

In this new digital world, however, the glee of solving such wordplay puzzles has stretched beyond a newspaper or book of crossword puzzles. Now, one can reach a whole world of free crossword puzzles ...