Civil Twilight is an isometric extraction horror game about learning the rules of Haejin City's anomalies while carrying out recovery orders.

The anomalies cannot all be handled the same way. They react differently to light, sound, and gunfire. Some rounds hit. Others pass straight through or bounce away. Against something you have never seen before, shooting first may be the wrong answer.

You learn the rules in the field. Live through a new behavior and the agency unlocks a verification record it already had on file. The next time you meet the same thing, you have a better idea whether to avoid it, lure it away, or fight.

An expedition begins at 22:00 and ends at 06:00. Streets connect differently whenever the fog lifts, the exit moves, and stronger anomalies appear toward dawn. Even after finding what the agency asked for, you still have to decide whether to investigate further or start looking for the way out.

Die and you lose everything except your equipped gear. Make it back and you can expand the base, buy equipment, and head to the next coordinates. Play alone or in a team of up to three.

In 19█3, the government sealed Haejin City behind a wall. A year later, agency staff still do not go inside. As a D-class agent, all you receive are coordinates and recovery lists over the radio.

The agency says every order is based on field reports. Sometimes its files mention things you have not reported yet.