The Portable Portal Transporter is an object that appears in the Adventures of Sonic the Hedgehog television series. It is a very large ray gun type of device that is able to transport people into books and release character from books into the real world. It was invented by Dr. Robotnik with intention of trapping Sonic and Tails in a book.
Dr. Robotnik, Scratch and Grounder chased Sonic and Tails into Mobius City Park, hoping to zap them with the Portable Portal Transporter. At the same time Miss Saccharine was in the park, reading fairy tales to a group of children. Tails hurt his tail and Sonic stopped to help him, Robotnik grabbed Sonic while he was stopped. Scratch and Grounder zapped Sonic and Tails with the portable portal transporter, but they accidentally zapped Robotnik as well and the three of them were all put into the story book. Somehow the machine broke after that.
Eventually Scratch and Grounder fixed it and fired it to release Robotnik from the story book. However the ray also reflected off a sign and hit the portable portal transporter, thus breaking it again.
Dr. Robotnik mentioned wanting to fix the portable portal transporter, hinting that he wanted to bring to life characters from a book called Scary Monsters that he had in his back pocket.