Triangle Challenge
Phineas O'Flaherty was driven insane trying to count the number of triangles in this pattern. How many are there?
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Triangle Challenge #2
It took a computer only a fraction of a second to identify all the triangles hidden in this figure. How many triangles can you locate in one minute?
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Triangle Puzzle #3 (Requires Flash plugin)
Someone made a mistake and put this triangle together wrong. Can you put it back together correctly?
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Nail Puzzle
Can you make these five squares into three squares by removing three of the nails? It's tricky but not impossible.
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Dog Puzzle
If you move just two nails, can you make this dog face the other way  and still keep his tail in the air?
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Hexagon Puzzle
Having discovered a way of constructing hexagons, the mathematician drew this figure. How many regular hexagons does it contain?
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Square Puzzle
Dave the draftsman has drawn some squares. Can you see how many there are? There are more than you'd think.
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Madam Puzzle
Sherlock Holmes instantly saw how many ways the word MADAM could be read from this pattern. Can you work out how many?
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Locker Puzzle
The teacher had to buy 34 new numbers for the school lockers, numbered 1 to 34. How many plates with the figure "1" on them did he buy?
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Phone Puzzle
The new "TwoSix Security" internal telephone featured a remarkable pushbutton system. Can you figure out where the buttons go?
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Math Puzzle
Can you fill in the missing numbers so that the sum of the numbers in each straight line equals the total in the middle?
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Star Puzzle
Can you fill in the missing numbers so that the sum of the numbers in each straight line equals the total in the middle?
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Roulette Wheel Puzzle
As a novelty feature, one of the roulette tables in Las Vegas casino introduced a most unusual wheel having eighteen...
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Magic Square Puzzle
Some of the numbers have fallen out of this magic square. Can you replace the numbers in the square so that each row adds up to 15?
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