Dual Ledger

Dual Ledger is a logic grid with two marks and three rules. Every square ends up a circle or a square, and when the grid is full: each row and column holds equal numbers of both, no three of the same mark ever sit side by side, and no two rows — or two columns — read the same. Tap a square once for a circle, twice for a square, a third time to clear it. Given marks carry a small dot and stay put. The moment a rule breaks — three alike in a line, or a line with too many of one mark — the offending squares turn red, so you are never guessing whether you went wrong. Every grid in Dual Ledger was filled by search first, then clues were removed one at a time for as long as the answer stayed unique. Each grid has exactly one way to finish it. Ten grids, from six by six up to twelve by twelve, with fewer given marks as you go. Each grid is fixed to its level. Offline, no accounts, no forced ads, nothing to buy. Features: - Equal marks in every row and column - Never three of the same mark in a row - No two rows or columns alike - Broken rules turn red immediately - Ten grids, six by six up to twelve by twelve - Works fully offline