Sudoku, the logic game with numbers
A grid, a few digits already placed, and a single rule: each row, each column and each box must contain each digit exactly once. Everything is deduced, nothing is guessed.
Available on the App Store (iPhone, iPad) and on Google Play (Android).
A puzzle from the app
Here is Easy puzzle #1 from the app: 50 given digits on a bluish background. The 4 levels (Easy, Medium, Hard and Inhuman) give fewer and fewer digits, and every puzzle has only one solution.
| 5 | empty | empty | empty | 3 | 4 | empty | 6 | 9 |
| 4 | 2 | 6 | 8 | empty | 9 | 5 | 3 | 7 |
| 3 | 8 | empty | 6 | 5 | 7 | empty | 2 | 1 |
| 1 | empty | 5 | empty | empty | 3 | 2 | empty | empty |
| 8 | 3 | 7 | empty | 9 | empty | empty | 4 | 6 |
| 6 | 9 | 2 | 4 | 8 | empty | 7 | 5 | empty |
| 2 | 1 | empty | empty | 7 | 6 | empty | 8 | empty |
| empty | 5 | empty | 9 | 2 | empty | 6 | empty | 4 |
| 9 | 6 | empty | empty | empty | empty | 3 | empty | empty |
The rules explain what the app accepts and flags, the techniques how to progress without guessing, and the examples give the solution to this puzzle.
Where to start?
The rules
The grid, the given digits, the row, column and box rule, and the app's buttons.
The levels
From Easy to Inhuman, the number of given digits, and the Custom grid.
The techniques
Candidates, the naked single, the hidden single and the naked pair, without ever guessing.
Solved grids
One grid for each level with its solution, and the first moves explained.
On phone and tablet
The app is played in portrait mode, on iPhone, iPad and Android. The images are screenshots of the current app.
