The Legend of Karl is a free-to-play action role-playing platformer with a side view in a fantasy setting. In a parallel universe, there are many worlds that rise and fall in their own space and time. They hold many stories, but what is hidden beyond them? The two worlds — Spirit and Man — are experiencing something more in this parallel universe. These two worlds actually influence each other, mirroring each other in every move and event, even though they are unaware of each other's existence.