Amber Sudoku

Amber Sudoku is a quiet, private sudoku: no account, no tracking, and your progress never leaves your phone, with 146,000 puzzles that each have exactly one solution and a permanent number you can pass along, a daily puzzle that ramps from gentle on Monday to expert on Sunday, and a streak that never asks you to pay to repair it. Puzzles you can trust. Every board is generated and checked to have exactly one solution, and none of them ever needs a guess. Four difficulties (Easy, Medium, Hard, Expert) are graded by the logic each puzzle actually requires, from simple singles up to X-wings and chains, so the label on the tin matches what is inside. Each difficulty holds ten years of play at ten puzzles a day, and every puzzle keeps its number for good: Hard #4,201 is the same grid for everyone, today and in a decade. Hints that teach. A hint does not just fill a square. It shows you the…