You're a stalker sent in to find artifacts, the strange crystals that form around anomalies. Find three, get past the mutants and radiation, and sell them to the trader at the bunker.
The detector (top left) beeps faster and its bar fills as you get closer to an artifact. They glow near anomalies.
Walk into a glowing artifact to pick it up. You need 3 before the trader will deal.
Watch health and radiation. Medkits heal you and clear radiation. You start with 3.
Follow the green light to the north. The compass (top right) points to it. Reach the bunker door to win.