I have seen puzzles like this and with higher prize. If this puzzle or the project wants to get more attention, you might want to add more ETH on the puzzle.
In that case, you'll get the puzzle solvers quickly and will eventually get their attention. Phemex did this but I don't know who actually won their puzzle.
thanks for your suggestions
batang_bitcoin,
this puzzle is simple, we have total prize pool of 10,000$ at the moment, we plan to spread it for various puzzles.
Each one more complicated and high paying then before.
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here is our announcement for the 10,000$ prize pool
https://medium.com/@thirmtoken/solve-puzzles-on-blockchain-win-10-000-2a4c7dd70311