Xinding Sun from University of California, Santa Barbara found yet another twist to the problem.įurther variants are discussed at the CTK Exchange - the old archive. The puzzle has appeared under various other names over the. Hint: The puzzle is hard and demands out-of-the-box thinking. The nine dots in a 3-by-3 two-axis grid shown. Nowhere is stated that the lines need to pass through the centre of the dots, so a simple three-line zigzag pattern would do it. I finally came up with a solution that technically followed the. The puzzle asks to link all nine dots using four straight lines or fewer, without lifting the pen. Join the nine dots in a 3-by-3 two-axis grid by 4 straight lines without visiting a dot more than once and without raising your pencil from the paper. Thought and points out even more of self-imposed restrictions that I missed considering the 9-point problem The task was to connect all 9 dots using 4 straight lines without ever picking up the. Now, try to think of a restriction you imposed on yourself which was not inherent to the problem.Īs an aside, Lars Hellvig from Stockholm, Sweden picks up this line of The solution lies in the observation that it's permissible to cross square boundaries. Show how to connect 9 dots in a square using only 4 straight lines if you are not allowed to take your pen off the paper. For one always comes up with 5 lines instead of 4. The problem is to connect the dots with no more than 4 straight lines without lifting your hand from the paper. One classical example is where nine dots are arranged on the sides and the center of a square as in the picture below. In this puzzle, you must connect all the dots using only 4 straight lines without lifting the pencil (ie: new lines must be connected to the previous one). This tricky math puzzle can be solved with the answer we have provided here. The best hint, in my view, is to mention that often, when solving a problem, we implicitly impose constraints that have not come with the problem. This puzzle is a great illustration of the importance of 'thinking outside the box' This is because this puzzle is seemingly impossible to connect all the dots with only 4 straight lines. Brain Test: How To Connect 9 Dots With 4 Straight Lines If you are genius solve this Cool Maths Game-Solution.
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