I created a brand new Sudoku game plugin for KOReader. It focuses on using human techniques to create and help solving puzzles without guessing. It is optimized for eink devices.
I hope you like it, do not hesitate to leave feedback if you find issues or improvement ideas!
Features:
- 17 Human Deductive Techniques: Complete logical solver ported from rustoku and HoDoKu logic. Every puzzle is 100% uniquely solvable through human deduction without guessing or brute-force trial-and-error, e.g., Naked/Hidden Singles or Pairs, X-Wing, Skyscraper, ...
- 6 Balanced Difficulty Tiers: Beginner, Easy, Medium, Hard, Master, and Expert, backed by an algorithmic generator for endless puzzle generation.
- Hint system that proposes which technique to use when stuck.
- E-Ink Optimized Display:
Region-bounded per-cell partial refreshes with zero full-screen flashing during normal tap-and-play.
- Rich Analytics & Game History:
Track total games, win rates, per-difficulty completion times, and active streaks.
Identify your most-missed solving techniques.
Interactive game log with mini-board previews and seed-based puzzle replay.
- Pen & Pencil Controls:
Optional "Auto-fill notes" and live rule-violation detection. Support for hardware buttons.
On-demand "Check Board" solver verification with clear strikethrough feedback.
Full Undo / Redo history.
- Built-in localization support (English, German included out-of-the-box).
Screenshots:
(see attached screenshot)
Download:
GitHub repository:
https://github.com/Borisvl/sudokuplus.koplugin
Tested with:
• Kobo / Tolino + KOReader
Tested version:
• KOReader v2026.07.1