It all started on a gloomy, rainy Thursday, when the school on Windmill Street seemed even more dull than usual. Emil, Lena and Patryk - the club's trio of self-proclaimed inventors - tiptoed through the corridor to ensure that no one but the caretaker Stefan would know where they were. Of course, the caretaker had his own theories about what they were doing, but he was unlikely to guess the truth. For the past two months they had been occupying an abandoned technical laboratory in the basement of the school. Between the dust, a pile of pastry boxes and a 1980s radio, they had built their own laboratory. It was here that alien civilisations of sticky notes and populations of pens missing in action found refuge. That day, Lena brought something special - a strange old device found in the attic at her grandfather's house. The box had knobs, buttons and its own slightly suspicious smell. It was meant to be just for fun - "Look, maybe we can get it working!" - exclaimed Lena as Emil and Patrick opened another packet of batteries as if they were going to conquer space. At first, nothing happened. The equipment muttered quietly and Lena tapped her finger on the screen, which looked like a miniature TV. Then, just after the fifth press of the green button and one not entirely controlled sneeze from Patrick, the device lit up with a feast of strange lights. A window appeared on the screen with the words: "MODE: ADVENTURE ACTIVE". Everything around began to change. First, a huge world map appeared on the wall - scrawled with a pencil and a black marker. After a while, tools began to slowly slide out of the cupboards.... no, they weren't tools. They were gadgets straight out of sci-fi movies: turbo pens that shoot paper balls, backpack hoovers and a helmet with an antenna that glowed blue. Emil stared at it all with an open mouth. "I think this is... some kind of interactive laboratory? But... by what miracle?" Lena had already managed to put on her helmet, which immediately started transmitting messages in Klingon (or maybe just very badly programmed Polish). Patrick picked up the backpack-duster, in which he sensed the sound of bubbling liquid. Then the door to the studio slammed shut with a bang. A voice rang out from the speakers: "Task: find the hidden ingredient. Time to go!" The lights began to flash alternately red and green, and the floor shook slightly. Emil, Lena and Patrick looked at each other as if they had just been drawn into a game that could not be stopped. And at that exact moment there was a crunching sound under the wardrobe and something began to squeeze from there.