Video Reflex (Atari 2600 - a2600)
You have to get to the point is the same color as the square of the error on. If you wait too long, or step on the wrong point, you will lose one of their eight lives. In later levels, you'll have a bug and butterfly. You must step on the error, and not a butterfly. Other levels of the two beetles and butterflies, and perhaps allow you to step on a bug or would require you to come to them in a certain order.