Daily Slitherlink challenge
One new 10×10 puzzle every day at midnight, your local time. Everyone plays the same one. Solve it every day to keep your streak, or pick a past day in the calendar.
Draw a single closed loop along the dotted lines. Each number tells how many of the four sides around it are part of the loop. The loop never branches or crosses itself, and squares without a number can have any number of sides used.