You can download the app 'Kids Coloring Fun' from the Windows app store. Each picture is very simple, and gives you access to a range of colours in the colour tray. The app is loaded with 190+ coloring pages. The grid set launches the installed program and allows the user to use their cursor to choose how they would like to colour the picture, and do this independently. The grid set is designed for simplicity, with left click enabled automatically (no need to select click method between each selection).