Nice game, I do feel like a hacker xD.
Sound is indeed loud and I didn't understand the likeness of the password. I was just guessing.
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Thanks for play it! Do you have play Fallout 3/4? It's the same game when you need to hack a terminal. The password is one of the 12 words that the console shows to you, and the likeness is the number of letters that your type has in common with the correct password. If the password is gamejam, and you type gonehat, your likeness is 3 because you have 3 letters in the same place as the correct password. It's similar to mastermind too. Give it another try!