Capture the flag
Real code-breakers compete in contests called capture the flag. Crack the message, then type the answer as a flag, like this: SOC{THE ANSWER}. Your score is kept on this device only — nothing is sent anywhere and there is nothing to sign up for.
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Why these four are different
The first six challenges are one cipher each. The last four need two steps and two branches: read the signal, or find the hiding place, and only then break the cipher. That is how it was really done, and it is why a code-breaker's first question is never "which cipher" but "what am I even looking at".