Welcome to the Infinite Highway of Survival - Episode 4

Stranded survivors crowd shaking cars, begging and bartering for food while something crawls on car roofs. A trader sells purified water and compressed biscuits for energy blocks or rare blueprints. After offers, a survivor trades biscuits and three bottles of water for an exoskeleton arm blueprint. He plans to fit it to his robot to open chests from a distance but lacks alloy and energy; he sleeps on it. Morning, the system lists leaderboard rewards and high casualties. Pressured to climb the ranks, the survivor tells the system, "I want to evolve," and the result remains unresolved.