Arm Description: In the study, the child's level of nomophobia will first be determined using a Personal Information Form and a nomophobia measurement tool. Subsequently, the mosaic puzzle intervention will be administered to the children in the experimental group twice a week for one hour over a period of five weeks, at times deemed appropriate by the school, and will be monitored by the researcher.

Mosaic Puzzle Initiative A mosaic puzzle is the process of creating a picture or image by putting together small crystal stones. It involves sticking the appropriate crystal stones onto a canvas painting using wax and a wax pencil, matching them with the symbols (letters, numbers, shapes, etc.) shown on the painting. (e.g., sticking blue crystal stones gathered under the * symbol onto the square marked with * on the canvas). The student presses the wax pencil onto the wax to pick up a small amount of wax. Then, they press the wax-coated pencil onto the crystal stone and stick it onto the

Arm Description: In the study, the child's level of nomophobia will first be determined using the Personal Information Form and the Nomophobia measurement tool in the control group. No intervention will be performed on the children in this group, and a test will be administered at the end of the intervention.

This study aims to investigate the effect of mosaic puzzle application on nomophobia in adolescents. The data for the study will be collected over a 5-week period. The experimental group children will be asked to play mosaic puzzle games for 1 hour, 2 days a week for 5 weeks at a time deemed appropriate by the school under the supervision of the researcher. The control group children will not be given any application; they will only be observed, and a final test will be administered at the end of the 5 weeks. The study is planned as a single-center study, and a total of 30 children aged 12-14 with a nomophobia scale score of 60 or higher who meet the inclusion criteria will be included in the study.

The Nomophobia Scale developed by Yıldırım and Correia (2015) is a Likert-type measure that assesses the level of fear experienced by children when they do not have access to their cell phones. The validity and reliability of the scale were studied by Özdemir and Bektaş (2020). The scale consists of 20 items. It is a 7-point Likert-type scale (1: Strongly disagree; 7: Strongly agree). The scale has four subscales: inability to access information, giving up comfort, inability to communicate, and loss of online connection. A score of 20 on the scale indicates no nomophobia, 21 ≤ NÖ Score < 60 indicates mild nomophobia, 60 ≤ NÖ Score < 100 indicates moderate nomophobia, and 100 ≤ NÖ Score ≤ 140 indicates severe nomophobia. The scale ranges from a minimum of 20 to a maximum of 140 points. As the score increases, the level of nomophobia increases. Individuals who score 61 or higher on the raw score can be classified as having 'severe or moderate' nomophobia.