As the dog, you must uncover the suspect’s secrets. As the suspect, your goal is to eliminate the agent dog and keep your secrets safe. You can pick up objects, use weapons, and interact in humorous ways (like kicking the dog or spitting at the person).
If you were actually looking for a free download to "sniff" or monitor internet traffic, is a highly popular, open-source choice.
It’s available for free on the Sniffnet website or via GitHub . Operation Sniff on Steam
