About SudokuIQ
Built and puzzle-tested by Chamara S. Kodikara
SudokuIQ connects polished browser games, two Android apps, cross-device continuation and a practical learning Academy.
How puzzles are made
Sudoku boards begin with a complete valid grid. The generator transforms rows, columns and digits, removes clues symmetrically, and runs a bounded backtracking count. A Classic puzzle is accepted only when exactly one solution remains; it is rejected when the count is zero or reaches two.
Coaching philosophy
Hints should explain a logical next move instead of replacing thought with a final answer. Notes, candidate removal, boosts and Academy lessons are designed around that principle.
Android connection
The Classic Sudoku and Killer Sudoku apps provide offline play and native phone controls. SudokuIQ’s transfer feature lets players continue supported games on another device.
Corrections and contact
Found a puzzle, lesson or accessibility issue? Email [email protected]. Useful corrections are reviewed and incorporated into future updates.
Puzzle integrity
Each generated board is checked for repeated givens and solution count. Killer cages are derived from the same solved grid, so every displayed total matches its cells. Difficulty names describe clue density and expected solving depth; they are guidance rather than a universal rating shared by every Sudoku publisher.
Explainable assistance
The teaching engine rebuilds candidates from the visible board, then searches named patterns from singles through locked candidates, subsets and several advanced line patterns. It distinguishes a proven deduction from a fallback solution reveal and never presents the latter as logic.
Privacy-aware continuation
Device transfer is optional and code based. A temporary game state is stored only when a player asks to move a puzzle, while ordinary board preferences and progress remain in browser storage.
Advertising independence
Gameplay, learning material and puzzle access do not depend on clicking an advertisement. Advertising areas are kept separate from board controls to reduce accidental interaction.
Maintenance record
Recent meaningful updates
- Logic Lab and learning-depth release
Added private puzzle analysis, candidate inspection, conflict validation, honest technique reporting and detailed proof standards for every Academy lesson.
- Availability and crawler reliability
Moved the public domain through a reliable dual-stack edge, verified Google crawler access and retained encrypted origin delivery.
- Interactive Academy
Introduced guided boards, cell-level candidate questions and engine-verified examples connected directly to live practice.