Colour pattern recognition allows the mind to more easily memorize chord patterns. You aren't required to memorize scales to play, but they are there, and you will be committing them to memory as you play without any added effort.
To Play: Look at the chord pattern, and the scale, and pick the correct notes on the keyboard by selecting the music notes (they turn yellow and play the note so you can hear what the chord sounds like)
For Android: Click the .apk from your phone (you can add it to your files, or to dropbox, and choose it from there). Accept the permissions, then click open once the installation is complete
For Windows: Click the .exe, accept the terms