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Welcome back, Agent.
You already found this place. Impressive.
You've found 0 / 5 secrets so far.
Hints for the others...
1. Some codes never go out of style (think 1986)
2. Developers love their consoles
3. Ctrl+U reveals all
4. POST to /api/challenge with the right key (X-Nimbus-Key: cloud9)
5. You're here already