Some fans attribute Gacek's fame to his confidence and cute face, others say it is his celebrity status that is attracting visitors to a city already known for its Pomeranian Dukes' Castle, parks and picturesque riverside setting.
Among those wanting to see Gacek was history student Kherlen, who comes from Mongolia and lives in Germany.
"I'm looking for that cat named Gacek," he told Reuters. "I hope I will find it, maybe today, maybe tomorrow."