Sod is an extreme modification of Wolfenstein 3D, released in 1999, that replaces standard graphics with pure geometrical forms in a stark black, white, and gray palette. As a mod, its core loop involves navigating and shooting within this highly abstract, disorienting architectural space, making target identification difficult. Its distinctive features include a minimalist aesthetic that rejects realism and a deliberately cryptic interface, appealing to players seeking a challenging, unconventional shooter experience.