Rullo
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Toggle each cell ON or OFF so every row sum and every column sum matches its target.
About Rullo
Toggle each cell ON or OFF so every row sum and every column sum matches its target. 30 verified unique-solution levels across 5 tiers.
Description provided by GameZipper.
How to play
- Start with the most constrained row or column — the one whose target is closest to a sum-of-all-cells in that line.
- If a row's target is very small, look for a single small cell to leave ON. If it is the full sum, leave everything ON.
- The hint reveals one cell of the unique solution. After using one, the rest of the grid is fully determined for skilled solvers.
- Undo lets you roll back the last few toggles without resetting the whole level — perfect for trial-and-error.
Controls
This game supports touch, keyboard, mouse input; the exact controls are explained inside the game.
Questions
- Is Rullo free?
- Yes. Rullo is a free HTML5 browser puzzle with no download.
- How many levels are included?
- Rullo includes 30 verified unique-solution levels across five difficulty tiers (Apprentice 4x4 up to Master 5x5).
- What makes Rullo different from Kakuro or Kakurasu?
- Kakuro is a free-form number-placement puzzle. Kakurasu is a one-shot shade puzzle. Rullo is a binary toggle puzzle: every number is fixed, you turn cells ON or OFF, and the running sum of all ON cells per row and column must hit the shown target. There is exactly one valid solution per level.
