Puzzle 1
If four kittens can catch four toys in four minutes …
… how many toys can twelve kittens catch in twelve minutes?
Puzzle Copyright © Kevin Stone
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Hint
How many toys can one kitten catch in twelve minutes?
Answer
36 toys.
Reasoning
Four kittens can catch four toys in four minutes,
so, one kitten can catch one toy in four minutes,
so, one kitten can catch three toys in twelve minutes,
so, twelve kittens can catch 36 toys in twelve minutes.
Puzzle 2
A large freshwater reservoir has two types of drainage system. Small pipes and large pipes.
6 large pipes, on their own, can drain the reservoir in 12 hours.
6 small pipes, on their own, can drain the reservoir in 18 hours.
How long will 6 large pipes and 6 small pipes take to drain the reservoir?
Puzzle Copyright © Kevin Stone
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Hint
How many reservoirs can each drain in 36 hours?
Answer
7 hours and 12 minutes.
Reasoning
We can use a time that 12 hours and 18 hours both fit in to, in 36 hours:
6 large pipes can drain 3 reservoirs.
6 small pipes can drain 2 reservoirs.
Therefore, together, 6 large and 6 small pipes can drain 5 reservoirs.
36 hours ÷ 5 = 7.2 hours for one reservoir.
7.2 hours = 7 hours and 12 minutes for one reservoir.
Puzzle 3
Can you find every occurrence of the word LEMON that appears in this grid (horizontally, vertically, or diagonally)?
The hint will reveal the number of times it occurs, but where are they?

Note: this puzzle is not interactive, and the letters cannot be selected.
Puzzle Copyright © Kevin Stone
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Hint
The word LEMON appears 47 times.
Answer
The word LEMON appears 47 times.
Puzzle 4
Art Theftall logic puzzles
After a local art theft, six suspects were interviewed.
Below is a summary of their statements.
Police knew that exactly four of them told one lie each, and all the other statements were true.
From this information, can you tell who committed the crime?
Alex said:
It wasn't Billie
It wasn't Drew
It wasn't Emery
Billie said:
It wasn't Alex
It wasn't Chris
It wasn't Emery
Chris said:
It wasn't Billie
It wasn't Frankie
It wasn't Emery
Drew said:
It wasn't Alex
It wasn't Frankie
It wasn't Chris
Emery said:
It wasn't Chris
It wasn't Drew
It wasn't Frankie
Frankie said:
It wasn't Chris
It wasn't Drew
It wasn't Alex
Puzzle Copyright © Kevin Stone
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Hint
If Alex had committed the crime, how many lies would there be?
Answer
Chris committed the crime.
Reasoning
We know that exactly 4 lies were told.
If it was Alex, then 3 lies would have been told (by those who said it wasn't Alex).
If it was Billie, then 2 lies would have been told.
If it was Chris, then 4 lies would have been told.
If it was Drew, then 3 lies would have been told.
If it was Emery, then 3 lies would have been told.
If it was Frankie, then 3 lies would have been told.
Therefore, it can only have been Chris.
Double-Checking
Since it was Chris, there were 14 truths, and 4 lies, for a total of 18 clues.