The CIA intercepted some messages from a criminal organization, some in English and some in an unknown foreign language or code. As a CIA analyst and translator, you have figured out the following sentences and their English translations, but you…
What is the perimeter of the outer rectangle? All angles shown are right angles.
Starting from this position, can the queen touch or pass through all nine highlighted squares in just four standard chess moves?
A criminal is planning an escape across a well-guarded bridge, which has a series of 9 guards, who each require a bribe of one coin in order to pass by them in either direction. The criminal can keep a stash…
P _ _ _ N TD E _ _ _ STS T _ _ _C _ _ _ E R Which 3-letter word can be inserted into all four lines above to form complete words?
This creative Leonid Kubbel chess puzzle has white take back a move and then checkmate! White just made a move, but then realized there was a mate in 1 on the last move and missed it. What was white’s last…
There are 100 face-down cards. The first person that passes by flips over every card, the 2nd person that passes by flips over every 2nd card, and so forth – the n-th person that passes by flips over every n-th…
You were walking around on a major street with 5-digit street numbers (for example, 11213) and noticed one of the street numbers was special – any two consecutive digits formed a 2-digit perfect square (in the order the digits appeared…
Replace the ?’s in each of these to complete the puzzle: Part 1 “Asia” is H“Cuffs” is S“Ender” is I“Redness” is F“Fuchsia” is ? Part 2 “Using” is E“Desist” is I“Visits” is E“Design” is ? Part 3 “Gross” is W…
There are five candidates participating in an unusual election. There are four rounds of voting, and only two candidates participate in each round, with the winner moving on and the loser dropping out. This means first candidate 1 will run…
There is an island known for its people with blue eyes, yet there is at least one green-eyed person on the island. No one knows the color of their own eyes, as there are no reflective surfaces on the island…
Try to place five points in (or on the perimeter of) an equilateral triangle with side length 10, as to maximize the distance between the points. What is the greatest possible distance between the two closest points?
You have two lengths of rope that take exactly 60 minutes to burn. The ropes burn unevenly so if you cut the rope in half, burning a half will not necessarily take 30 minutes. How do you precisely measure 45…
There are three identical boxes of apples and oranges, except one contains all apples, one contains all oranges, and one contains a mix. The boxes are labeled “apples”, “oranges”, and “apples and oranges” but all 3 boxes were labeled incorrectly!…