Arthur sat in the dim light of his study, his cursor hovering over the white canvas of the Thames. He clicked the Circle—a suburban hub—and dragged a thin, pale blue line to the Triangle in the city center. A tiny, rectangular train car materialized instantly, humming to life with a soft, melodic chime. It began its first loop, picking up two tiny commuters and dropping them off at the Square.
: Design a subway map for a growing city without letting any station overcrowd. download-mini-metro-build-9249478
Arthur tried to delete the red line to re-route it, but a train was already halfway across a bridge. He was too late. The timer hit zero. Arthur sat in the dim light of his