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Any suggestions or improvements, send an email to penpaplus@gmail.com or create an issue here.

Insructions to use the tool here.

Some FAQs here. Changelogs here.

Penpa+ Version 2.24.21, Credits

Shading - Dark Grey, Black:
Number - Normal, L, M, S - Green, Blue, Red Sudoku - Normal, Centre - Green, Blue, Red:
Line - Green, Double:
Edge - Green, Double:
Wall - Green:
Shape - Shape - Square - Option 2:
Shape - Shape - Circle - M size - Options 1 & 2:
Shape - Shape - Corner triangle - Options 1 to 4:
Shape - Arrow - Small - Options 1 to 8:
Shape - Number - Math - Black, Green - Options 2 & 3:
Shape - Special 1 - Battleship - Black - Options 1 to 6:
Shape - Special 1 - Tent - Option 2:
Shape - Special 1 - Star - Options 1 to 3: