Universe K (Jenny Everywhere and the Lord of Hell)
From Jenny Everywhere Wiki
Jenny Everywhere once briefly shifted into a universe identical to a highly-pixelated, 2D video game, while trying to defeat Lord Grallyx, taking him along with her so as to retcon him into the fabric of that universe. With Jenny appearing as a player character with only three lives, and Grallyx as a powerful boss throwing crates at her, Jenny soon decided to shift them again. (PROSE: Jenny Everywhere and the Lord of Hell)