Sudoku - Brain
Puzzles
Sudoku - Brain
Puzzles
Experience the ultimate puzzle collection. Master Classic, Killer, Sandwich, Jigsaw, Kropki, Thermo, Arrow, Fog of War, and now Skyscraper, Anti-Knight, Windoku, Odd/Even & Column Indexer — 27 variants in all. Sudoku - Brain Puzzles brings color, life, and tactile joy to the game.
We took the classic game and polished it until it shines. No clutter, just pure logic bliss.
Endless puzzles with unique solutions. Choose from Easy, Medium, or Hard and enjoy a clean, distraction-free design.
Play Classic, Killer, Sandwich, Diagonal, Jigsaw, Kropki, Thermo, Arrow, Little Killer, Fog of War, Mega 16x16, Mini 6x6, and the five new ones: Skyscraper, Anti-Knight, Windoku, Odd/Even and Column Indexer. Most come as a free Mini 6x6 grid as well as a full 9x9 board.
A fresh puzzle every midnight. Build your winning streak and check the calendar to replay past days.
Don't just get the answer—learn WHY. Every hint names the technique it used and draws its pattern on the board: "hidden pair", "pointing triple", "X-wing". 33 techniques, in all 12 languages the app speaks.
Make it yours with 5 themes (Classic, Cozy, Ocean, Sunset, Forest), 4 symbol styles (Classic, Fruity, Ocean, Geometry), and full Light/Dark mode support.
Play anywhere. Your progress syncs across all devices via iCloud, complete with Game Center leaderboards.
Hear your logic. Every digit plays a musical note, each completed box rings out a chord, and solving ends on a satisfying cadence. Choose your key and instrument — Off, On, or Headphones Only. A calm, accessibility-friendly way to play, on all 27 variants.
Master 15 exciting Sudoku variants. Pick one and learn the rules! Or jump straight in and play Sudoku free in your browser.
Place numbers 1-9 in every empty cell to complete the puzzle.
Every row must contain numbers 1-9 exactly once. No repeats!
Every column must contain numbers 1-9 exactly once. No repeats!
Every 3×3 box must contain numbers 1-9 exactly once. No repeats!
Each row, column, and 3×3 box must contain 1-9 exactly once.
Dotted lines show cages. Small numbers are target sums.
Numbers in each cage must add up to the target sum.
Numbers cannot repeat within a cage, even if the sum is correct.
Each row, column, and box must contain all symbols exactly once.
A 16×16 grid using numbers 1-9 and letters A-G (10-16).
Uses numbers 1-9 and letters A-G (representing 10-16).
Each row, column, and 4×4 box must contain all 16 symbols exactly once.
Each row, column, and 3×3 box must contain 1-9 exactly once.
Clues surround the grid showing sums for each row and column.
Clues show the sum of numbers between 1 and 9 in each row/column.
The clue equals the sum of all digits between 1 and 9 in that row.
Each row, column, and 3×3 box must contain 1-9 exactly once.
A standard 9×9 grid with two highlighted diagonals.
The diagonal from top-left to bottom-right must also contain 1-9.
The diagonal from top-right to bottom-left must also contain 1-9.
Each row and column must contain 1-9 exactly once, just like classic Sudoku.
Coloured regions show the jigsaw shapes. Each colour is one region that must hold every digit once.
Because the regions are irregular, box-based scanning changes — follow the region outlines instead of straight 3×3 blocks.
Mini Jigsaw plays the same way on a 6×6 grid with six irregular regions using digits 1-6 — a gentle way to learn.
Each row, column, and 3×3 box must contain 1-9 exactly once.
Dots sit on the borders between cells. White = consecutive, black = double.
A black dot means one digit is exactly double the other (a 2:1 ratio), such as 3 and 6.
If there is no dot between two cells, they are neither consecutive nor double — a powerful deduction. Mini Kropki brings the same dots to a 6×6 grid.
Each row, column, and 3×3 box must contain 1-9 exactly once.
Digits must strictly increase from the round bulb to the tip — no repeats along a thermometer.
The bulb always holds the lowest digit; each cell's position limits its value. Mini Thermo brings the same rule to a 6×6 grid.
Each row, column, and 3×3 box must contain 1-9 exactly once.
The digits along an arrow's path add up to the digit in its circled cell.
Because it holds the sum, the circle is the biggest digit on its arrow — and digits may repeat on the path. Mini Arrow brings the same rule to a 6×6 grid.
Fog covers the grid from the first move — even the given digits. One cell's row, column, and 3×3 box are left clear, and that cross is your way in.
Place a digit correctly and the fog lifts from its cell and the eight cells touching it, uncovering whatever givens were hiding there. Solve outward and your clear area keeps growing.
A wrong digit counts as a mistake and clears no fog at all. You never need to guess: every puzzle is checked to be solvable step by step from the opening cross.
Every game mixes in 2–4 hidden rules — killer cages, kropki dots, thermometers, or arrows. Their markings sit under the fog and appear as you uncover them, and only a few are drawn, so a marking you cannot see means nothing. Mini Fog of War (6×6) is free.
Each row, column, and 3×3 box must contain 1-9 exactly once.
Each digit is a building height. The number outside counts how many rooftops you can see from that side — here 4, 6 and 9, so the clue is 3.
A clue of 1 puts the 9 right next to it; a clue of 9 fills the line 1-9 in order. Puzzles are generated unique under the visibility rule, so the clues are never decoration. Mini Skyscraper (6×6) is free.
Each row, column, and 3×3 box must contain 1-9 exactly once.
A chess knight moves two cells one way and one across. The 7 here bans a 7 from all eight cells it can jump to — selecting a cell in the app highlights them for you.
A knight peer is never in the same row or column, and only a couple share the box — so nearly every knight elimination is information no other rule gives you. Mini Anti-Knight (6×6) is free.
Each row, column, and 3×3 box must contain 1-9 exactly once.
Each shaded 3×3 window must hold 1-9 exactly once, just like a row or a box. They sit one cell in from the border, so none of them lines up with a standard box.
The nine purple cells — four corners, four edge midpoints, and the centre — also hold 1-9 exactly once. Nothing draws it, but it follows from the four windows. Mini Windoku (6×6) is free.
Each row, column, and 3×3 box must contain 1-9 exactly once.
A circled cell holds 1, 3, 5, 7 or 9. A squared cell holds 2, 4, 6 or 8. Unmarked cells are free — an absent marker is not a clue.
Every row, column and box holds exactly five odd digits and four even ones. So a region can carry at most four squares — and once it does, every other cell in it is odd. Mini Odd/Even (6×6) is free.
Each row, column, and 3×3 box must contain 1-9 exactly once.
In every row, the digit in column 1 says which column holds that row’s 1. Here row 4 has a 6 in column 1 — so the 1 of row 4 is in column 6. Columns 5 and 9 do the same for the 5 and the 9.
The rule is symmetric, so deductions come in pairs: a 5 in column 1 forces a 1 in column 5, and a 9 in column 5 forces a 5 in column 9. Column Indexer is 9×9 premium — the 1-5-9 rule has no 6×6 form.