The solution, shown on the right, should be easy but is very hard in practice. On the left are shown nine dots to be connected by four straight lines, without lifting the pen from the paper and without retracing any lines. It was first discussed by the US psychologist Norman R(aymond) F(rederick) Maier (1900–1977) in an article in the Journal of Comparative Psychology in 1930. It is often used to illustrate lateral thinking and is a perfect example of ‘thinking outside the box’. Participants are presented with a set of dots arranged in a 3x3 grid and challenged to connect all nine dots, without lifting their pencil from the paper, using the fewest possible number of straight lines. Fewer than 5 per cent of undergraduate students manage to solve it in two minutes, and most are convinced by then that no solution exists. The nine dot problem is a classic lateral thinking exercise that gained widespread popularity in the 1970's and 80's. If symmetric solutions are considered equivalent, then it is a well-defined problem, and it should be easy, because there are only a few possibilities to try, but it is difficult in practice for psychological reasons. The logic puzzles you've come to love from Puzzle Baron, now on your favorite tablet! New features like multi-level undo, auto-x abilities and custom error checking make logic solving a breeze.A reasoning problem in which the task is to connect nine dots, arranged in a square, by four straight lines drawn without lifting the pen from the paper and without retracing any lines (see illustration). Logic Puzzles for iPad and Android Tablets Similarly, if A = B, and B =/= D, then A must not equal D. For example, if A = B, and B = C, then A must equal C. But Mark McGuinness challenges the conventional explanation. Eventually you will have filled in enough X's and O's on the board that you will then be able to use simple logic to deduce the solution to the puzzle. The 9 dots, 4 lines puzzle is often used to teach the value of thinking outside the box. Furthermore, since every option can only be used once in any given puzzle, you can eliminate the four other options for Bryant in that category (1937, 1946, 1961, 1975) and the four other options for 1971 (Anahi, Jayden, Lauren and Nikolas).Ĭontinue doing this for every clue you're given. These seriously tricky dot puzzles will drive you mad but do you have the skills to solve it The Playbuzz quiz is leaving adults stumped as just one in five can solve all. Similarly, if you know that Bryant was born in 1971, you can add an O in the appropriate box. Design by Japanese modeler Akio Yamamoto. Although the difficulty level is not high, the puzzle has a soft, formative beauty that will compel the puzzler to continue touching and manipulating, even after solving. If you know, for example, that Lauren wasn't born in 1961, you can add an X in the box where the Lauren column and 1961 row meet. Regularly aligned points become connection lines, and the lines weave the surface. You can eliminate pairs you know aren't true with an X, and pencil in pairs you know are related with an O. The grid allows you to cross-reference every possible option in every category. educated guesses are not required).Ī custom-labeled grid is provided for every puzzle, like the one you see to the right. ![]() Each puzzle has only one unique solution, and each can be solved using simple logical processes (i.e. Your goal is to figure out which options are linked together based on a series of given clues. ![]() In each puzzle you are given a series of categories, and an equal number of options within each category. Logic puzzles come in all shapes and sizes, but the kind of puzzles we offer here are most commonly referred to as "logic grid" puzzles. Feel free to solve online just for fun, or, for an added challenge, register a free account and compete against thousands of other solvers to make it into our Logic Puzzle Hall of Fame! Welcome to the world's largest web site devoted to logic puzzles! We've got more than 25,000 unique puzzles available for play, both online and the old fashioned way - with pencil and paper.
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