This overly complicated and tangled circuit is a key combination.
To operate, toggle the four inputs at the top right from left to right to unlock (the led at the bottom right will turn on to indicate it has been unlocked).
If any other combination is entered, the led will not turn on.
You might need to hit one of the three last inputs after loading the circuit to turn off the led.
If you have any questions or comments, don't hesitate to leave a comment.
