Superflat Preset- Lightwalk by nobodybestfriend

This is NOT a command. Do not try to put this is a command block, as nothing will happen. Instead, put this in the preset box for custom superflat.

Wherever a player walks, they will hear pistons and see light. Also, at the bottom of the world, you can see from the void a line that players have walked across.

Note: Not suitable for survival. Also, turn off generated structures.