Two wheels simultaneously make one full turn in the same direction along a straight line. They left the trace shown. In which direction did the wheels turn?
This challenge comes from the brand new Grabarchuk book 103 Puzzle Quizzes! Their highly rated PuzzleBook: Puzzle Quizzes series can be played on any Kindle device or any other device using the free Kindle app (for example your PC or iPad). It should be noted that while this puzzle is hard, the series is created for all kinds of solvers-beginners, skillful, and expert alike. The puzzles are arranged so that you start with the easy (*) ones, and progress to the really hard (*****). In addition to visual-spatial problems, you’ll also find geometry, coins, matchsticks, searching, counting, and all sorts of brain-teasing goodness inside!
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