We can create apps using app inventor online, using a gmail account, dragging and dropping mobile components (screen 1, designer mode) and then create a puzzle with the behavior of our app (screen 2, block mode). At the end we obtained a QR code to download and to install in our mobile. One example is Paint Pot. We can put famous painting images (converted in black and white, not a cat image) in order to be painted with your finger using your Android mobile. Apps created for the this project are being included in resources.