Engineer Humpty was a Commodore 64 game. In Engineer Humpty there were several different screens showing a maze that you had to navigate Humpty's spanner through. The screen showed the entire layout including conveyor belts and different bits of machinery you had to avoid. Then the maze was covered up and you had to make your way through from memory, with only a small area surrounding the spanner showing - very difficult! You had to use the joystick to move the spanner in different directions, but if you touched a piece of machinery or conveyor belt you lost a life. If you managed to get the 'spanner in the works' the game border would flash and you moved on to the next level.
Engineer Humpty was produced under the working title 'Humpty the Engineer'.