Rescuer is a first-person shooter with survival elements. A fighter needs regular intake of water and food. His arsenal includes a pistol, 4 types of assault rifles, a shotgun, a rocket launcher, smoke and explosive grenades. The barrels are customizable. They are also allowed to install silencers, flashlights, and optical sights. Most weapons are not issued initially, but are purchased. To buy a new gun or an attachment for it, you need to find a special store on the map. The shops also sell food and ammunition. The locations here are quite large. You can move along them on foot or by transport. There are several types of cars. Each of them is controlled differently.

The story campaign in Rescuer is divided into 7 acts. The story itself begins with the arrival of a hero named Ryan in a strange region. A military school graduate wants to check rumors about people disappearing and being turned into robots. Soon the information is confirmed. The villain Matthew, using scientific experiments, is trying to create an army and build his own empire. He and his henchmen are opposed by a group of rebels led by Johnnie. The protagonist begins to carry out small tasks for them, gradually moving on to increasingly larger tasks. The action takes place in an open world. There are hidden collectibles and Easter eggs scattered throughout the area. You can go into houses and loot them.