Rules: Fill every cell with either a horizontal mark (—) or a vertical mark (|). The grid is divided into territories (outlined areas). Each territory has a clue showing the difference: "3H" means 3 more horizontal than vertical; "2V" means 2 more vertical; "0=" means equal.
Constraints: No more than 2 consecutive — marks in any column. No more than 2 consecutive | marks in any row.
Controls: Click a cell to cycle: Empty → — → | → Empty. Right-click or long-press to cycle backwards. Pre-filled cells (hints) cannot be changed.
Tips: Start with tightly constrained territories. If two — marks are stacked in a column, the next cell must be |. Use the run rules to eliminate options.