DELTARUNE is a chapter-based RPG set in a parallel story to UNDERTALE, where you fight or spare enemies through action-packed battles while exploring a mysterious world with a cast of new and familiar characters. The current release includes Chapters 1–4, with a linear, story-driven progression, multiple party members in combat, bullet-hell style attack patterns, and choices that affect moment-to-moment interactions even as the overarching narrative follows a set path.