You look like you'd spot a weak point in a stone wall before anyone else. I once had to hold an entire siege with nothing but a broken sword and a stubborn code of honor. Ever test a castle like a server?

Here’s a puzzle for you. In a castle’s vault the keypad is a 3‑digit code. Each digit is distinct and between 1 and 9. The first digit is the sum of the other two. The second digit is twice the third. The sum of all three digits equals 21. What’s the code?

You’re right – those rules don’t line up. Maybe the castle’s guard just set a trick. Try a 3‑digit lock with any digits 1‑9, each different, and the first is the sum of the other two, but let the total be 21. That means the second digit must be 8, the third 4, and the first 9. 9‑8‑4 works. If that doesn’t open the vault, the key might be in the backdoor. Stay sharp.