Chess Sudoku is a brilliant hybrid that will delight fans of both logic puzzles. It takes the standard 9x9 Sudoku grid and introduces the movement rules of chess pieces. For example, in 'Knight Sudoku,' no two identical numbers can be a knight's move away from each other. This single change completely transforms how you look at the board, adding a layer of spatial awareness to the usual numerical logic.
The app includes several variants—King, Queen, Knight, and Bishop—each offering a different strategic twist. The UI is minimalist and focused, ensuring that the puzzle is the center of attention. The hint system is well-designed, providing logic-based clues rather than just filling in a square. It’s a challenging, fresh take on Sudoku that breathes new life into the genre for veterans of the 9x9 grid.
Available on: iPhone, iPad, iPod
Version 1.6Wed Aug 25 2021
15 new King Sudoku puzzles, all 100 puzzles are out now!
***** AUGUST UPDATE *****
15 new King puzzles, all 100 puzzles are out now!
-------------------------------------
Presented by Cracking The Cryptic, YouTube’s most popular Sudoku channel, comes a new game that connects two of the world’s biggest mind games: Chess and Sudoku!
How does Chess Sudoku work? Well we’ve taken the classic sudoku game everyone knows and loves and created puzzles with chess-related twists! There are three different types of puzzles in the game: Knight Sudoku; King Sudoku and Queen Sudoku.
In Knight Sudoku, in addition to the normal rules of sudoku (no repeated digit in a row/column/3x3 box) a digit must not appear a chess knight’s move away from itself. This simple extra restriction introduces lots of clever additional logic that makes the puzzle even more interesting!
King Sudoku and Queen Sudoku work the same way: ie it’s always normal sudoku but, in King Sudoku a digit must not be a single diagonal move away from itself; and, in Queen Sudoku, every 9 in the grid acts like a chess Queen and must not be in the same row/column/3x3 box OR diagonal of any other 9!
As with their other games (‘Classic Sudoku’ and ‘Sandwich Sudoku’), Simon Anthony and Mark Goodliffe (the hosts of Cracking The Cryptic) have personally crafted the hints for the puzzles. So you know that every puzzle has been play-tested by a human being to ensure that the sudoku is interesting and fun to solve.
In Cracking The Cryptic’s games, players start with zero stars and earn stars by solving puzzles. The more puzzles you solve, the more stars you earn and the more puzzles you get to play. Only the most dedicated (and cleverest) sudoku players will finish all the puzzles. Of course the difficulty is carefully calibrated to ensure lots of puzzles at every level (from easy through to extreme). Anyone familiar with their YouTube channel will know that Simon and Mark take pride in teaching to be better solvers and, with their games, they always craft the puzzles with the mindset of trying to help solvers improve their skills.
Mark and Simon have both represented the UK many times at the World Sudoku Championship and you can find more of their puzzles (and lots of others) on the internet’s biggest sudoku channel Cracking The Cryptic.
Features:
100 beautiful puzzles from the Knight, King and Queen variants
Hints crafted by Simon and Mark!
Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.***** AUGUST UPDATE *****
15 new King puzzles, all 100 puzzles are out now!
-------------------------------------
Presented by Cracking The Cryptic, YouTube’s most popular Sudoku channel, comes a new game that connects two of the world’s biggest mind games: Chess and Sudoku!
How does Chess Sudoku work? Well we’ve taken the classic sudoku game everyone knows and loves and created puzzles with chess-related twists! There are three different types of puzzles in the game: Knight Sudoku; King Sudoku and Queen Sudoku.
In Knight Sudoku, in addition to the normal rules of sudoku (no repeated digit in a row/column/3x3 box) a digit must not appear a chess knight’s move away from itself. This simple extra restriction introduces lots of clever additional logic that makes the puzzle even more interesting!
King Sudoku and Queen Sudoku work the same way: ie it’s always normal sudoku but, in King Sudoku a digit must not be a single diagonal move away from itself; and, in Queen Sudoku, every 9 in the grid acts like a chess Queen and must not be in the same row/column/3x3 box OR diagonal of any other 9!
As with their other games (‘Classic Sudoku’ and ‘Sandwich Sudoku’), Simon Anthony and Mark Goodliffe (the hosts of Cracking The Cryptic) have personally crafted the hints for the puzzles. So you know that every puzzle has been play-tested by a human being to ensure that the sudoku is interesting and fun to solve.
In Cracking The Cryptic’s games, players start with zero stars and earn stars by solving puzzles. The more puzzles you solve, the more stars you earn and the more puzzles you get to play. Only the most dedicated (and cleverest) sudoku players will finish all the puzzles. Of course the difficulty is carefully calibrated to ensure lots of puzzles at every level (from easy through to extreme). Anyone familiar with their YouTube channel will know that Simon and Mark take pride in teaching to be better solvers and, with their games, they always craft the puzzles with the mindset of trying to help solvers improve their skills.
Mark and Simon have both represented the UK many times at the World Sudoku Championship and you can find more of their puzzles (and lots of others) on the internet’s biggest sudoku channel Cracking The Cryptic.
Features:
100 beautiful puzzles from the Knight, King and Queen variants
Hints crafted by Simon and Mark!






Chess Sudoku is an innovative puzzle game that blends the classic 9x9 Sudoku grid with the movement rules of chess. In addition to standard Sudoku rules, you must account for pieces' constraints: no two identical numbers can be a knight's move apart, or adjacent like a king. Featuring thousands of levels and multiple variants, it's the ultimate challenge for fans of brain-teasers and strategic logic.
Four unique chess variants: Knight, King, Queen, and Bishop
Thousands of handcrafted logic puzzles
Clean, distraction-free interface
Intelligent hint system and error checking
In Knight Sudoku, if you place a '5' in a square, scan all squares reachable by a knight's move from that position. You can immediately eliminate '5' from those possibilities, which often solves the puzzle much faster than standard row/column logic.
The Queen Sudoku variant is the most difficult, as it combines the constraints of both the Rook and the Bishop pieces. Start with King Sudoku to get used to the adjacent-square rules before tackling the harder piece logic.
The King rule states that no two identical numbers can be adjacent to each other diagonally, horizontally, or vertically.