With a single button press (often bound to a side mouse button), the mod will automatically place a block under you and jump simultaneously. This allows you to build a tower straight up in seconds without looking down.

While holding a block, the mod automatically places blocks beneath your feet as you move forward. The "189 hot" variants include "vertical offset" settings to prevent you from falling into gaps. This is the most requested feature for BedWars bridging.

Despite its cryptic name, this mod (originally coded for Minecraft Java Edition, but now with unofficial ports for Minetest and Vintage Story) does one simple thing:
It removes the 0.25-second built-in delay between block placements, letting you place up to 189 blocks per second — or “189 hot” as insiders say.