Cursed Demon Keyboard (also known unofficially as The Demon Keyboard/ The Mysterious Keyboard) is an item that was advertised by a mysterious TV pop-up ad-bot. As per it's name, it is a sinister, monstrous, almost organic evil keyboard emanating dangerous and powerful dark (if not demonic) magic that the mysterious Mr. Puzzles peddled to a increasingly crazed and desperate SMG4 who was hellbent on crafted what he hoped to be his "most perfect video", to which he bought it to assist in his editing and compositing.
It is the central antagonistic plot element in SMG4 Movie: IT'S GOTTA BE PERFECT, containing an unknown but powerful and amorphous demonic entity that fed on SMG4's obsessive and crazed state and his use of it unleashing it and allowing it to envelop and assimilate Peach's Castle, leading Swagmaster6969696969, Chris Gordman and the Mushroom Kingdom Armed Forces to reluctantly sink the castle. Thankfully, SMG4 would be brought back to his senses by SMG3, Mario, and Meggy Spletzer, who managed to rescue him, with SMG3 personally throwing the Keyboard out the window, leaving it at the old castle underground. It is in the old castle that sunk, OR had been consumed until later on.
