Dark Notes is a dark mystery and puzzle game developed by HeartBeat Plus, delving into a new genre with a unique storyline. Players take on the roles of two protagonists, navigating through time and space to uncover the hidden secrets of Happiness Mall. As the narrative unfolds, a shared secret between the protagonists emerges, blurring the lines between truth and fiction.

The game features a dual-protagonist perspective, offering players a distinctive gaming experience as they piece together the darkness from different viewpoints. With multiple versions of truth intertwined with challenging puzzles closely tied to the plot, players are in for a mind-twisting journey. Dark Notes boasts a realistic graphic style, immersing players in a bleak mall setting with eerie lighting and a haunting atmosphere.