Heartbeat: Regret is a horror rhythm-typing game. It's a tough game where you are hunted in a mansion by a dark monster. Unusually, you need to press buttons in time with the audible heart beat to move around and then type directions to take specific actions.

You play through seven compact, gradually challenging levels as you explore the mansion and discover your history. In each chapter you must avoid the dark presence that roams the mansion. You open doors, descend stairs, hide and set traps.

But more than a simple beat to follow, you need to pay attention to your changing heart's rhythm to press buttons efficiently. As you press the button in time with your heart you can slow your heart down. If you don't manage this eventually you can have a heart attack. You also need to listen to the growl sounds of the monster to avoid him and find a way out.