Background and Worldview: You are a dead postman trapped in the “Gap Zone” between life and Shadow. You need to deliver “letters of longing” to the wandering souls in this gap, helping them fulfill their wishes to be reincarnated. But you must deliver them before the “Fog of Oblivion” engulfs you, or you will disappear forever. The Gap Zone’s scenery is composed of fragments of the dreams of the living, sometimes a school, sometimes a battlefield, sometimes a hospital.

Core Gameplay: You are in a semi-transparent state and can briefly “blur” (by clicking a button) to pass through certain physical obstacles, but you will be vulnerable to spirit damage (from other vengeful spirits) while in this state. Letter delivery has a time limit, and each spirit has specific preferences: you need to perform specific actions while running (such as three jumps or two slides) to “match” the letter’s content before it can be delivered.

Features: “Emotional Color” System: The colors of the surrounding environment reflect the current area’s mood (red = anger, blue = sadness, yellow = happiness), and different colored areas affect your movement speed. You can “possess” (by long-pressing on an item in the scene) to temporarily gain the item’s abilities (e.g., possessing a street lamp will emit a bright light to dispel vengeful spirits). Multiple Endings: Each spirit’s happiness level will affect your final destiny.

Level Introduction: There are 1000 levels in total, corresponding to 1000 spirit missions. The first 200 are easy, the middle 500 are normal, and the last 300 are high difficulty. Each spirit has an independent story.