Littered throughout the vibrant tracks of Sayonara Wild Heart's world are hearts. The small, filled in hearts are worth a few points, but they are always placed together in rows. Each successive heart you pick up is worth more points, so getting an entire row of hearts is worth a decent amount of points. In fact, this seems to apply to just about any kind of heart you pick up in the game, even the big hearts that are not filled in. As long as you keep picking up hearts at a good rate, the combo multiplier will apply and you will earn lots of points. So, in order to get the best score, you need to be constantly picking up hearts - even the small ones as they will still add to your combo multiplier.