Yes, you can. The default interface of Virtual Piano is based on a 5 Octave Piano Keyboard with 61 keys; 36 white and 25 black. You can extend Virtual Piano to a full 88 key piano keyboard when you use Transpose function (under Sound settings). Transpose feature was added in order to expand the range of songs that you can play on Virtual Piano. The transpose button allows you to transpose by 12 keys, in either direction; both lower and higher. On mobile and tablet, the number of keys displayed on screen will depend on your screen size. You can easily access other keys by sliding the scrollbar under the keys.