Sudoku Input and Solve

Overview
Sudoku Input and Solve is an engaging app that lets players enter, store, sort, and solve Sudoku puzzles at their convenience with a host of intuitive features.

Key Features
1. Input personal or collected Sudoku problems for later solving.
2. Easily sort puzzles by difficulty and choose preferred challenges.
3. Advanced difficulty analysis replicating human-solving approaches.
4. Efficient solving tools reduce pre-solving preparation.
5. Custom problem creation matched to desired difficulty levels.
6. Logical problem verification ensures all puzzles have unique solutions.
7. Auto-solve mode to confirm correctness and offer solutions.
8. Split-screen compatibility for convenient problem entry from different sources.
9. Streamlined functionality to exclude numbers in rows, columns, and blocks with a single touch.
10. Highlighting of selected numbers for increased visibility and reduced strain.
11. Flexible memo entry for potential or excluded options.
12. History feature to revisit saved Sudoku puzzles.
13. Track your input and solved problem counts.
14. In-progress game suspension and resumption for flexible play.
15. Dark theme support for comfortable, eye-friendly viewing.
16. Support for split-screen functionality enriching the user experience.

Interesting Gameplay
1. Each Sudoku puzzle is a grid of 9x9 spaces divided into 3x3 subgrids.
2. Fill in the blanks so each row, column, and 3x3 subgrid contains each digit from 1 to 9 without repetition.
3. Use the number reviewing feature to prevent oversight errors.
4. Apply the auto-solve feature to cross-verify answers or find solutions when stuck.
5. Experience the thrill of crafting unique puzzles with the problem creator based on complexity preference.
6. Keep gameplay fascinating by filtering and solving puzzles of varying difficulties as skills grow.
7. Test created puzzles with an auto-validation feature ensuring logical solvability.
8. Benefit from an uncluttered game interrupted—for a quick breather—with saving to return right where left off.