# A driver run with sudo sends no keys: "Can't open display"

## Symptoms

A script that reads game memory as root and steers with `xdotool` prints `Failed creating new
xdo instance` and `Error: Can't open display: (null)`; the game gets no keys.

## Cause

`sudo` resets the environment and drops `DISPLAY` (*observed*).

## What to do

Pass it through: `sudo env DISPLAY=:1 python3 follow.py ...`.