Can I use my activation key on more than one computer? Niklas February 17, 2017 11:24 Updated An activation key can be used to activate Bad Piggies on a maximum of three Windows PCs. Related articles How can I get an activation key? I'm sure I'm connected to the Internet, so why is the game saying that the registration has failed? I switched to fullscreen mode and I see graphical errors! What's up with that? Why am I not getting any updates? How can I get an activation key? Comments 0 comments Article is closed for comments.