For those that want to have an actual go at it: when deploying it with hardhat for example, you can pass in Math.floor(Math.random()*1000) as the constructor argument in the deploy script, and then see if you can derive the number on the first guess.
BTW @cypherpunks was right. Anyone can view the contract deployment transaction and see the value of secretNumber that was passed as an argument to the constructor.
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