All the grids on this page are grids that ship with the app, read from its code. Their solution was found by the app's solver, then checked by a second program, which also confirms that it is the only one.
The first moves of an Easy grid
Easy grid #1 in the app: 50 given digits. Singles are enough from start to finish, in 31 moves. Here are the first 5:
row 1, column 2: 7, the only candidate for the cell (naked single).
row 1, column 3: 1, the only candidate for the cell (naked single).
row 1, column 4: 2, the only candidate for the cell (naked single).
row 1, column 7: 8, the only candidate for the cell (naked single).
row 2, column 5: 1, the only candidate for the cell (naked single).
5
7
1
2
3
4
8
6
9
4
2
6
8
1
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
One grid from each level
Easy, grid #1
50 given digits, unique 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
At the start.
See the solution
5
7
1
2
3
4
8
6
9
4
2
6
8
1
9
5
3
7
3
8
9
6
5
7
4
2
1
1
4
5
7
6
3
2
9
8
8
3
7
5
9
2
1
4
6
6
9
2
4
8
1
7
5
3
2
1
4
3
7
6
9
8
5
7
5
3
9
2
8
6
1
4
9
6
8
1
4
5
3
7
2
Medium, grid #8
40 given digits, unique solution.
7
empty
5
empty
2
4
8
6
empty
empty
empty
9
empty
empty
5
2
empty
empty
4
empty
1
empty
9
6
empty
empty
5
empty
5
empty
2
empty
9
empty
empty
6
empty
9
7
empty
empty
empty
5
empty
empty
2
6
empty
empty
5
8
9
empty
1
empty
4
empty
6
empty
empty
1
5
7
empty
1
6
9
empty
7
empty
empty
8
8
7
empty
empty
empty
empty
empty
9
empty
At the start.
See the solution
7
3
5
1
2
4
8
6
9
6
8
9
3
7
5
2
1
4
4
2
1
8
9
6
3
7
5
3
5
8
2
1
9
7
4
6
1
9
7
4
6
3
5
8
2
2
6
4
7
5
8
9
3
1
9
4
3
6
8
2
1
5
7
5
1
6
9
3
7
4
2
8
8
7
2
5
4
1
6
9
3
Hard, grid #14
30 given digits, unique solution.
6
empty
9
8
empty
empty
empty
empty
empty
2
empty
empty
empty
empty
empty
8
1
empty
empty
7
empty
empty
empty
3
4
empty
empty
7
empty
1
3
empty
empty
empty
empty
8
empty
5
4
empty
empty
empty
6
empty
empty
empty
empty
empty
6
1
9
empty
empty
empty
empty
2
empty
empty
7
empty
1
6
3
empty
8
empty
empty
empty
5
empty
empty
empty
3
empty
7
empty
empty
empty
2
empty
5
At the start.
See the solution
6
1
9
8
4
7
3
5
2
2
4
3
5
9
6
8
1
7
5
7
8
1
2
3
4
9
6
7
6
1
3
5
4
9
2
8
9
5
4
7
8
2
6
3
1
8
3
2
6
1
9
5
7
4
4
2
5
9
7
8
1
6
3
1
8
6
2
3
5
7
4
9
3
9
7
4
6
1
2
8
5
Inhuman, puzzle #22
20 given digits, unique solution.
empty
2
empty
4
empty
empty
empty
7
empty
empty
8
3
empty
1
empty
empty
empty
empty
empty
empty
empty
empty
empty
empty
empty
empty
empty
7
empty
empty
empty
2
empty
empty
4
empty
empty
empty
empty
6
empty
9
empty
empty
empty
empty
empty
empty
empty
8
empty
empty
empty
empty
5
empty
empty
empty
empty
empty
1
empty
8
6
empty
empty
7
3
2
empty
empty
empty
empty
empty
empty
empty
empty
empty
3
empty
empty
At the start.
See the solution
1
2
5
4
6
8
9
7
3
9
8
3
2
1
7
6
5
4
4
7
6
3
9
5
2
8
1
7
5
9
1
2
3
8
4
6
8
4
1
6
7
9
5
3
2
3
6
2
5
8
4
7
1
9
5
3
7
9
4
6
1
2
8
6
1
8
7
3
2
4
9
5
2
9
4
8
5
1
3
6
7
An ambiguous puzzle, rejected
Let's start from Inhuman puzzle #22 and remove a single given digit: the 2 in row 1, column 2 (boxed cell). 19 digits remain, but the puzzle now has at least 2 solutions. If entered in Custom, it would be rejected: the app requires a unique solution.