🧹 Street Sweeper

Tips & Strategy

• Sweep the borders first. The outer ring is the easiest to trap yourself in — take it while the middle is still open.
• Never enter a dead-end corridor unless it's the last thing left. If a sweep enters on one tile wide, it can never come back.
• Think in strips. The classic solution is boustrophedon — up one column, across, down the next. Improvise only when obstacles force you.
• Leave the center for last. Open space is flexibility; spend it when the remaining dirty tiles are scattered.