Chapter 5: The electric door
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It was like a miracle. As if I was guided by a greater intelligence. I typed the numbers that first came into my mind. A green light appeared on the metallic device and the door opened. This wagon was bigger than the other ones and it was filled with multiple private passenger cabins. When I arrived at the next wagon door and saw that it was locked again, I saw there was a diary lying on the floor. I picked it up and read the last entry:
"Perché mi sono dovuto sedere nella cabina con il numero sfortunato? Da quando il treno è entrato nel tunnel sono successe cose strane e la gente ha iniziato a perdere la testa. Ho paura. Mi nasconderò nel prossimo vagone. Se qualcuno lo trova: se vuoi aprire la porta elettrica al prossimo vagone, devi combinare i 3 cavi corretti. Lascerò un suggerimento segreto per te nella mia cabina. Se trovi il suggerimento, saprai quali sono i cavi corretti."
There were some cables at the wagon door:
I had to investigate the cabin of this mysterious passenger. But which one was his cabin? I looked in all cabins, but they were all empty except of 4: Cabin 8, cabin 13, cabin 17 and cabin 21.
Task: Find the secret hint from the passenger to identify which 3 cables need to be combined.