What makes a puzzle easy or hard
Sudoku puzzles come in various difficulty levels, from easy to extremely challenging.
Difficulty is determined by several factors:
1. Number of given clues - Easy puzzles have 30-35 givens, hard puzzles may have only 17-20.
2. Required solving techniques - Easy puzzles need only basic logic, while hard puzzles require advanced techniques.
3. Distribution of clues - Well-distributed clues make puzzles easier.
4. Logical path complexity - Hard puzzles may require looking many steps ahead.
Common difficulty levels are: Easy, Medium, Hard, Expert/Evil.
As you progress, you'll learn techniques that make harder puzzles solvable.