The app "Gusse-Kreft" is an introduction to a patient course for the youngest children, their family and friends. The purpose is to prepare and reassure children who have little experience with the equipment and concepts they encounter in the hospital. The information is with a narrator - with a child's voice - and animation in the genre "Learning through play with tablet/mobile phone". Children in this age group learn and experience through play and concrete information. Hospitalized children can quickly become overwhelmed by a lot of information. Therefore, "Gusse - Kreft" is made up of short sequences suitable for younger children. The stories reflect reality and current clinical guidelines. Healthcare professionals can use this material as an educational tool to create a common understanding with the child. "Gusse - Kreft" is a Norwegian version of the Danish "HC And - Krft", which has been developed in collaboration between H.C. Andersen Brne- og Ungehospital, Odense University Hospital, hospitalized children and their families and 10:30 Visual Communication. The app "Gusse - Cancer" with Norwegian speech was developed in collaboration with Else B. Stlen and the cancer department at the Children's and Youth Clinic, St. Olav's Hospital, University Hospital in Trondheim. Contents: Nina's leukemia Nils' brain tumor Mask and CT examination Radiation treatment Chemotherapy Anesthesia CVK Everyday life at the hospital At home with cancer Cancer outpatient clinic Game The app is free to download. Enjoy yourself