NeuroGym is an interactive and fun game platform for assessment and training for seniors and people with dementia. Redesigning elderly games based on research results, data of players’ cognition are collected and analysed with machine learning models. It allows caretakers, elderly centers and doctors to better monitor and assess their conditions and provide timely treatment. The major features are: 1. Voluntary and enjoyable domain-specific training 2. Longitudinal disease monitoring with personalized reports 3. Early-screening for the disease and alert for follow-up