The aim of this study is to evaluate a novel tablet game-based neurodevelopmental assessment tool for young children aged 3 to 8 years old. The study's main aims are: (1) to determine whether the novel tablet-game based assessment tool can accurately differentiate children's neurodevelopmental status based on their performance on the game and (2) assess the validity of the game-based neurodevelopment assessment tool. The study aims to recruit 590 children who are 'typically' developing and/or have a diagnosed neurodevelopmental disorder including Attention Deficit Hyperactivity Disorder (ADHD), Autism Spectrum Disorder (ASD), Specific Learning Disorder, or a Communication Disorder. All participants will complete the tablet game-based assessment which aims to assess a range of neuropsychological functions including attention, memory, language, motor, executive functions and social-emotional skills. Parents/carers of participants will also complete a demographic questionnaire and the Adaptive Behaviour System - Third Edition (ABAS-3), which is a questionnaire that assesses a child's development. Some participants will be re-tested on the tablet game-based assessment approximately 2 weeks after the first tablet game-based assessment to ensure the game's validity.