심심할땐 Sudoku

This Sudoku puzzle app is perfect for when you're bored!

It offers a variety of difficulty levels to suit everyone from beginners to experts.
The clean, intuitive UI allows you to focus on solving puzzles without distractions,
and the hint and undo functions make playing easy.

Key Features:
- Various Difficulties: Beginner, Intermediate, Advanced, Expert
- Hints: Use hints whenever you get stuck
- Undo: Try again without worrying about mistakes
- Notes: Record potential numbers and strategically solve the puzzle
- Clean Interface: Simple design for focus
- Includes ads (optional)

Enjoy Sudoku anytime, anywhere and challenge your brain!