If you played Undertale, you surely remember Sans. This skeleton may look rather scary, but he’s actually a nice guy. He adores everything beautiful and stands for peace and justice. And now he will join Boyfriend and Girlfriend on stage for a riveting rap battle! Your goal is to gain a maximum score by hitting the right buttons in time with the beat. Watch the arrows floating through the screen closely – they will hint at the key you have to press right now to earn points. Doing it for some time without mistakes will allow you to impress the audience with amazing combos!