The meta post on math question gives three characteristics of math puzzle:
First: "Clever or elegant solution, often an "aha" moment"
But: "That "aha" moment depends on the final answer. What if the answer is 1 or pi? That will be considered an "aha" moment as per this characteristic. Ramanujan gave some equations which helps us to find the value of pi. Those equations are also "aha" but they cannot be considered puzzles"
Second: "Unexpected problem statement"
But:"Does that mean if there is Prof. Halfbrain in the question then it is a puzzle? Of course not."
Harry walked from village $X$ to village $Y$ which took him $8$ hours.
Then he walked back from $Y$ to $X$ (following the one and only exact-same path) in altogether $9$ hours and $20$ minutes.
When walking uphill, Harry makes $5.6$ miles per hour.
When walking in the plane, he makes $6.3$ mi...
I'm playing this old text adventure game for the computer. It's a fantasy game based on magic and such. In the game there are hints on how to progress the game. I have solved a few, but these other ones are very challenging. It looks like the author changes the methodology for each puzzle. T...
