Sure! Here's a simple piano game implemented in a single HTML file using JavaScript. It can be played on a smartphone and includes pictograms for the piano keys.
Piano Game
This code sets up a piano game interface with white and black keys from C2 to C3. When a key is clicked, the playSound function is called which can be further implemented to play the corresponding sound associated with the specific key.
Please note that the sound playing part is not implemented in this code, as it requires additional audio files and player implementation. You can add your own code to handle playing the audio files based on the key pressed.