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We used [dnSpy](https://github.com/0xd4d/dnSpy) to decompile Harekaze15Puzzle.exe.

In Form1 instance, this.rnd is a random number generator that was initialized with a seed.
The seed is -24110677 that was found by setting a breakpoint.

To get the flag, this.rnd have to generate a random number 1001 times.
Perform FlagGenerator.ShowFlag with this.rnd shows the flag.


this.rnd = new Random(-24110677);

for (int i = 0; i < 1001; i ++) {
this.rnd.Next(16);
}

FlagGenerator.ShowFlag(this.rnd);