What Puzzle Am I Looking For?

Here are the requirements for the puzzle I want:

1. Takes hours for a human to solve (10+ hours). Solvable virtually.

2. Not solvable by a machine — or at least takes a machine significantly longer than a human (e.g., 10× longer than a human solver).

3. Quick to verify (ideally seconds).

4. Mass-generatable by either a human or a computer (I should be able to produce many instances easily).

Requirements #1 and #2 are mandatory. Any puzzle that fails either of these is immediately disqualified.

For #3, I can tolerate verification taking up to 5 minutes. I can also tolerate verification procedures that are probabilistic — for example, ones that confirm correctness with 95% confidence instead of 100%.

For #4, Assuming requirements #1–#3 are satisfied, the quality of a puzzle is judged mainly by how easily it can be mass-generated. Ideally:

• Tier 1: A puzzle that a human can generate in under 5 minutes, without using code or an LLM.

• Tier 2: A puzzle generated by simple code (I know “simple” is subjective, but I'll use my own judgment).

• Tire 3: A puzzle that can only be generated with the help of an LLM
  

Example of simple code: Generally codes that doesnt require the use of LLM, involving simple logics.
For example, code that piece together a bunch of smaller images into a bigger image is rather simple. code that does arithmetic calculations are rather simple.

I will award the person coming up with the best puzzle a 5000 mana prize.

If someone came up with a qualified Tier 1 puzzle I will resolve the market immediately. If no one managed to come up with a Tier 1 puzzle I will resolve the market based on the best (mass-generatable) proposed puzzle at the end of 2025.