Undertale 18+ would rule 63 is a gender-swapped version of the popular video game Undertale, where characters and their roles are reversed in terms of gender. The game explores different dynamics and interactions between the characters in this new setting, creating a fresh and unique experience for players familiar with the original game. With mature themes and content, Undertale 18+ would rule 63 offers a more adult-oriented take on the beloved universe of Undertale.