Pencil Loop!

Draw lines along the edges between dots to build one continuous loop that returns to itself. Use numbered cells as clues; each number tells you how many of its bordering edges are part of the loop. Avoid branches and crossings; the loop cannot split, intersect, or end abruptly. Tap edges to toggle lines and use marks to note edges you believe cannot be part of the loop. Expand from certain clues first, then use deductions to connect sections of the loop logically. Finish the puzzle when one closed loop is completed and all numbered constraints are satisfied.