Fill the grid with different shapes.
Each line and area must not contain same shape.

Either drag the shapes to the desired location
OR
Mouse over where you want a shape to be, then press the corresponding key. (Recommended)
For example:
1 - Circle
2 - Diamond
3 - Pentagon

To remove shapes, use the mouse and drag them out, or reset the puzzle.

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For my other guides, they are here:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2880052179