Logic Square
How to Play Logic Square
Logic Square is a refined digital version of the classic Nonogram (also known as Picross or Griddlers). It is a logic puzzle where you use numerical clues to reveal a hidden pixel-art picture on a $10 \times 10$ grid.
The Objective
Your goal is to fill the correct squares in a grid based on the numbers provided at the top of each column and the left of each row. When every correct square is filled, a hidden image (like a heart, a house, or a fish) will be revealed.
Official Rules
The numbers in each row and column indicate the “runs” of filled cells:
- Continuous Groups: A number like “5” means there are 5 consecutive black squares in that line.
- Multiple Groups: If a row says “2 3”, it means there is a block of 2 filled cells, followed by at least one empty cell, and then a block of 3 filled cells.
- Grid Logic: All squares must either be Filled (part of the picture) or Marked (empty space).
- Lives & Mistakes: You start with 3 lives. If you use the Check button and have incorrectly filled cells, those cells will be cleared and you will lose one life (🖤).
Understanding the Controls
The game features two primary interaction modes located in the header:
| Mode | Action | Visual |
| ✏️ Fill | Click/Drag to color a cell black. | Dark Blue/Black Square |
| ✕ Mark | Click/Drag to mark a cell as empty. | Red “X” |
- Crosshair Highlight: Hovering over a cell highlights its entire row and column, making it easier to track which clues you are currently working on.
- Clue Strikethrough: When the filled cells in a row or column perfectly match the numerical clues, the numbers will turn grey and get a line through them (~~3~~).
Top Strategies to Win
Find the “Guaranteed” Fills
Look for large numbers. For example, in a $10 \times 10$ grid, a clue of “10” means the entire row is filled. A clue of “6” in a row means that at least the middle two squares must be filled, regardless of where the block of 6 starts or ends.
Mark the “Definitely Empty” Spaces
The ✕ Mark mode is just as important as the Fill mode. Once you have completed a group of filled cells, place an X on either side of it. This prevents you from accidentally over-filling a line and helps narrow down the possibilities for neighboring clues.
Use the “Check” Button Judiciously
If you aren’t sure about a section, the Check button can verify your work. However, remember that mistakes found during a check will cost you a life. It’s best used when you feel you have a solid “base” but aren’t sure if your logic is still on track.
The Crosshair Advantage
The blue highlight follows your mouse or finger across the grid. Use this to quickly verify that your current fill matches the number listed at the top and side without having to count manually every time.