This has a fine thrilling atmosphere especially because of the BGM, but I got stuck of how to complete the riddle.
(A BIT SPOILER) I got the supposed "last message" but where do I input it? Typing it casually in the void? Or in the search column? And it became more confusing for me when Carroll's last post could be drag away but revealing nothing and only the black blank space (is that a bug or intentional? )^^;