Mega Sudoku 22×22 Solver
The ultimate Sudoku challenge — a 22×22 grid with 484 cells and 2×11 boxes. Enter your puzzle and solve it instantly.
or generate a puzzle to get started
About Mega Sudoku 22×22
Mega Sudoku 22×22 is the largest standard variant of the classic Sudoku puzzle. The grid is divided into 22 rectangular boxes of 2 rows × 11 columns, and uses the symbols 1–9 plus A–M (22 symbols total). Every row, column, and box must contain each symbol exactly once.
Due to the size of the grid (484 cells), puzzle generation is done without uniqueness verification to keep performance practical. The solver uses efficient constraint-checking backtracking to find solutions quickly.
Frequently Asked Questions
How many cells does a 22×22 Sudoku have?
A 22×22 grid has 484 cells. You fill them using 22 different symbols: digits 1–9 and letters A through M.
What are the box dimensions in 22×22 Sudoku?
The boxes are 2 rows × 11 columns. There are 22 such boxes in total, arranged in 11 columns of 2 rows each.
Is the 22×22 solver fast?
The instant solver uses backtracking optimized for large grids. For most well-constrained puzzles it solves in under a second. Animated solving is not available for 22×22 due to the large number of steps.
Can I input my own 22×22 puzzle?
Yes — click any cell, then use the number pad or keyboard to enter digits 1–9 and letters A–M. Then click Solve Instant.
How to Play Mega Sudoku 22×22
1 Rules
- ✓ Fill every row with all 22 symbols (digits 1–9 and letters A–M), no repeats.
- ✓ Fill every column with all 22 symbols, no repeats.
- ✓ Fill every 2×11 rectangular region with all 22 symbols, no repeats.
- ✓ Pre-filled clue cells cannot be changed.
2 Strategies
- 💡 Region Focus: The wide 2×11 regions span the full grid width — any clue symbol in one region row immediately eliminates it from the other row of that region.
- 💡 Symbol Mapping: Treat A=10, B=11 … M=22. Scan for both digits and letters separately to avoid missing placements among the 22 distinct symbols.
- 💡 Dense Rows First: Start with rows and columns that have the most clues — their candidates narrow fastest and cascade into adjacent, sparser areas.
Tip: With 484 cells and 22 symbols, manual solving is a serious endurance challenge. Use Solve Animated to watch the backtracking algorithm tackle the board one cell at a time.