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Relatively simple: you get a submission box to type in a number. You must predict the random number the site will generate.
If we can control the timestamp option on the form, we control the seed. If we control the seed, we control what random number comes next.
First of all, let's edit the timestamp to be 1 and see what happens. Funnily enough, the website tells us we were wrong and that the correct answer is 1. We can do this again,this time changing our guess to 1 BOOM! Flag acquired.