

My friend sent me an altered Moonlight Sonata sheet and told me to decipher it (I know nothing about music)
A friend sent me what looks like an edited version of Beethoven’s Moonlight Sonata along with a weird piano keyboard cipher chart and told me there’s a hidden message inside it.
Problem is: I have basically zero background in music theory, sheet music, or piano.
From what I understand, the notes might correspond to letters using the attached keyboard chart, but I have no idea how to properly read the sheet music or identify which notes are important.
I’m guessing the hidden message could involve:
altered notes
specific melodies
repeated patterns
timing/rhythm
or some kind of musical cryptography
I already tried randomly matching notes to letters but got nowhere.
Could anyone help analyze it or point me in the right direction? Even explaining how to start comparing the edited version to the original would help a lot.