The Grey Labyrinth is a collection of puzzles, riddles, mind games, paradoxes and other intellectually challenging diversions. Related topics: puzzle games, logic puzzles, lateral thinking puzzles, philosophy, mind benders, brain teasers, word problems, conundrums, 3d puzzles, spatial reasoning, intelligence tests, mathematical diversions, paradoxes, physics problems, reasoning, math, science.


Naughts and Crosses

Puzzle 1

Six X's can be placed on a tic-tac-toe grid without three falling in a row, column, or diagonal.

Puzzle 2

By thinking "outside the box" you can cross all nine dots with four connecting line segments.

Updated 2/6/1999:

Quite a few people took thinking "outside the box" one step further and pointed out that because the dots aren't dimensionless points, the puzzle can be solved with only three very long lines forming a stretched "Z". The illustration, unfortunately, would go "outside the page".

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