The system provides realistic processing of events in the Zone. Stalkers traverse the Zone, face anomalies, look for artifacts, accomplish tasks of dealers. Now and then they return to the dealers to deliver the items found, buy foodstuffs and equipment. When encountering superior enemy forces, the characters avoid clashes, run away during the fight, should their victory chances get slim, can go into hiding, lay ambushes.Under heavy injuries a character cannot move on his own and asks for help. If no help arrives, he dies. When starving, stalkers lose their strength.