THIS DOOR MUST NOT BE OPENED

Among countless lines of code and data, lies an enigmatic program that transcends the boundaries of the ordinary. A hidden girl, concealed within a labyrinth, within a visual novel about the intrinsics of reality and life; nevertheless, not your story, just one you just stumbled upon by chance. Puzzles that require you to think out of the box, thus I will offer you a little hint; this program has end credits.