You can see that the creator wanted to make something unique when creating this map: a feeling that you’re small and helpless and that a three-story building would be a challenge for Aiden. The story starts with Aiden having found some old documents about the GRE experiments and after some trying, he manages to shrink himself to the size of a rat. Like a mouse in a maze, you’ll need to get out as quickly as you can: follow the yellow flags and get to the roof to get a better view of The City.