Penning the Ghosts of Ourselves: An Exploration Into Spectral Play presents my experiments into the creation of spectres through autobiographical game design. This supplemental document explores my interdisciplinary process in game design, creative writing, and book illustration and design which resulted in the physical publication of the solo role-playing game in Dwelling. In Penning the Ghosts of Ourselves, I present the research, documentation, and reflection on this process of self-interment through autobiography, as it is undertaken through both players of Dwelling, and myself as its creator.