Blindecho

Blindecho is a Fabric mod that turns the world almost completely dark. Each sound a player makes, including footsteps, mining, combat and other actions, sends out an expanding echo wave that briefly reveals nearby surfaces. Echolocation runs in real time, so the layout of caves, structures and terrain is built up from what the player hears rather than what the player sees.

The sound model follows different materials. Water and lava change how an echo travels, so the same action can reveal different shapes depending on where it happens. The mod is aimed at players who want horror and survival gameplay built around tension, uncertainty and exploration. Its first-person camera setting adds to the immersion, and the author recommends pairing the mod with other mods for the most immersive result.

Blindecho runs on the client alone, so only the player needs it. Builds are published for Fabric across 1.20.1, 1.21, 1.21.1 and 26.1.2, and the latest file targets 26.1.2. The code is released under All rights reserved, so it is not open source.