Sym-a-Pix

About Sym-a-Pix

Sym-a-Pix symmetry logic puzzle: fill an N×N grid with 0/1 cells so that every clue equals the number of filled 8-neighbors AND the grid is 180° rotationally symmetric. 30 hand-crafted puzzles across 5 difficulty tiers.

Description provided by GameZipper.

How to play

1. Click a cell to fill it (turn it on). Right-click or long-press to clear it.
2. Clue 0 : all 8 neighbors must be empty (the cell itself can be either).
3. Clue 9 : all 8 neighbors must be filled.
4. Cross-reference adjacent clues: if clue A says "3 filled" and clue B (overlapping 5 cells with A) says "5 filled", you can deduce which cells are uniquely determined.
5. The grid must be point-symmetric : cell (r,c) equals cell (N-1-r, N-1-c). Use this to halve your work!
6. The puzzle is solved when every clue matches AND the grid is symmetric.

Controls

This game supports touch, keyboard, mouse input; the exact controls are explained inside the game.

Questions

What is Sym-a-Pix?

Sym-a-Pix is a symmetry logic puzzle invented by Conceptis. Each cell shows a number 0–9 telling you how many of its 8 neighbors are filled. Fill in cells so every clue is satisfied AND the final grid is point-symmetric (180° rotational symmetry around the center).

How do you play Sym-a-Pix?

Click a cell to toggle it between filled (black) and empty (white). Right-click or long-press toggles the opposite. A clue 0 means all 8 neighbors must be empty; a clue 9 means all 8 must be filled. Cross-reference between adjacent clues to deduce the rest. The puzzle is solved when every clue matches AND the grid is point-symmetric.

Is Sym-a-Pix free?

Yes, completely free in your browser. No download required, works on mobile and desktop.