itch.io

in my experience you do 0+the first port number on a calculator then just hit enter until you get a matching number port number

Yeah, it took me a minute to figure it out, too. So when you hack something, you'll see a series of three numbers. These numbers follow a pattern (a different pattern for each lock), and you have to guess the next number based on the pattern. For example, one of them doubles the number each time, while another moves the digits one to the left each time.