A City Sleeps is a horizontally scrolling twin-stick shooter. The player controls Poe, a dream exorcist that enters the nightmares of the citizens of SanLo City to help free them of a force that controls the city. The player moves Poe around the screen with one controller stick and aims her weapon with the other to dodge the torrent of bullets the nightmare forces fire at her and defeat them with her own weapon. (wikipedia.org)