Machine Learning Could Create the Perfect Game Bosses

You turn left, then right, weaving between pillars to collect precious orbs while dodging its advance. For a moment, it seems you've lost it. But then your foe appears around a corner, and bam! The familiar Game Over screen appears--but then, just below, something different. You lasted just a few seconds in this hair-raising chase, so, adrenaline still pumping, you tap "Hard."