Slitherlink is a logic puzzle where you draw a single continuous loop on a grid of dots.

• Tap an edge between two dots to toggle it: empty → line → X
• Numbers in cells tell you how many of that cell's 4 sides belong to the loop
• 0 means none of its sides are part of the loop (mark them X)
• 3 means three of its four sides are part of the loop
• The loop must be one continuous closed loop with no branches
• Green cells = satisfied, Red cells = violated

Keyboard: Arrow keys to move cursor, Space to toggle, Z to undo