With a gorgeous cast of memorable and rip-roarious characters, a sublime soundtrack, and punchy, RPG-meets-bullet hell gameplay, Undertale is a one-of-a-kind experience that many flipped gamers' expectations about storytelling, violence, and progression in video games on their head. That said, it has since inspired a slew of great titles, and its themes and mechanics hardly came out of nowhere. Undertale is threaded with loving references to (and wry parodies of) other video games, many from which it is spiritually descended.