A giant crossword puzzle has been painted on the side of a 100-foot tall building in Lvov, Ukraine. Clues to the puzzle are planted throughout the city, and the puzzle's answers are revealed at nighttime with the use of special lights.
"There is one interesting detail about the design of the puzzle. It looks like an empty puzzle during the day-light, but at night when special lights are on the words in the puzzle become visible with a lightly-glowing fluorescent color."
"The questions for this crossword puzzle are located in different point of interests of the city, like monuments, theaters, fountains etc. So people while walking around the city can try to answer the questions and writing down the answers. When the night comes to the city they can meet at this house and check their degree of intelligence."
FULL STORY: A Puzzle on the House
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