This circuit began with two different codes, two LEDs, and a potentiometer. At one point, my circuit looked like this:

A terrible circuit.

I was confused as to why I could not properly read the button. I should have brought my notebook to work. A few hours of tinkering and figuring out how the conditional statements and operations worked, and a game had emerged. This is the end result:

A better circuit.

The goal of the game is simple. Turn on the green LED and only the green LED. Push the button, cover the light sensor, and turn the dial. Cheat codes are below.