SudokuLab

SudokuLab generates a fresh sudoku puzzle right on your device every time — no two grids are ever the same, and none of them come from a fixed level pack.

Difficulty isn't just "fewer starting numbers." A human-style solver rates every puzzle by which technique it actually requires — simple singles, naked and hidden pairs, or genuine guesswork — and the generator removes cells until it lands exactly on the level you picked. Tap a cell, use the number pad to fill it in, and get instant highlighting across the row, column, and box, plus every other cell sharing the same digit.

Features:
• Puzzles generated fresh on-device — never a repeated grid or a canned level pack
• Difficulty rated by required solving technique, not just givens count
• Technique badges show exactly what a puzzle demands: singles, pairs, or guesswork
• Row/column/box highlighting plus same-digit highlighting when you select a cell
• Mistake detection, hints, and a running timer
• Puzzle history and stats: best times per difficulty and a 12-week activity view
• Everything stays on your device — no account, no cloud, no ads