Tosia was six years old, had red pigtails and was very fond of adventures. One day, when it got quiet in her room and the sunshine danced on the floor, Tosia noticed something strange. In the corner, where the blocks usually lay, a small, colourful door had appeared. They were not much bigger than a doll's house, but they shone with a soft glow, as if someone had painted a rainbow on them. Tosia crouched down and touched the handle. The door suddenly opened and a light, sweet scent of bubble gum flower wafted from behind it. Tosia heard quiet laughter and saw that inside the door was not a room, but a completely different world! On the other side stretched a colourful meadow full of leaping bunnies in blue hats and flying candy butterflies. Tosia looked at her teddies sitting on the bed and whispered: "Come with me!" She picked up her favourite teddy bear, Jas, and carefully slipped one leg through the door. Suddenly she heard a mysterious voice: "Whoever passes through the Rainbow Portal must solve the riddle!" Tosia felt her heart beating faster. She closed her eyes and wondered what awaited her on the other side of the door....