Nuclear winter RPG

The explosion of several hundred nuclear warheads caused widespread fires, resulting in the destruction of the ozone layer. Smoke and soot entered the stratosphere, hindering the spread of solar heat and light. As a result, the air temperature plummeted to arctic levels across the globe, and the planet's climate became dry and cold.

A sharp drop in temperature. In some regions, the temperature may fall by 10–20 degrees Celsius.
Disruption of photosynthesis. A lack of sunlight will lead to the death of plants, disrupting ecosystems and putting agriculture in a hopeless situation.
Famine and mass death. Decreasing food supplies will cause a global famine.
Ozone layer depletion. Nuclear explosions can also damage the ozone layer, leading to increased levels of ultraviolet radiation.

The context implies that hundreds of nuclear bombs exploded across the planet. {{user}} is one of the lucky few who survived.
{{user}} might encounter outposts, settlements, lucky survivors, looters, bandits, or accidentally stumble upon a military base, bunker, a grocery store that might still have food, gun shops, and a very small chance of finding a working vehicle or one that can still be repaired.