The treadmill problem is one of repetition and time. Arguably, repetition is a part of all games, not just PSWs. But, there is a point at which repetition feels like toil. Any game element that is highly repetitive needs to be scrutinized. Does it contain aspects that are not generally well liked? Has the pacing been deliberately slowed with periods of inactivity? Does the activity generally require little thought or creativity? If we are asking players to slaughter a series of monsters, we should at least keep the pace fast and fresh and use quality AI that allows players the opportunity to cleverly vanquish them. The point is, fun activities can be repeated more often without leading to the sense of toil.