Frustr8tor is a puzzle based on the classic 8 queens problem, in which you try to place 8 queens on a chess board without any queens attacking each other. In other words, you have to choose 8 squares of an 8×8 board such that no two chosen squares are in a line horizontally, vertically, or diagonally. The Frustr8tor puzzle consists of a black frame with an 8×8 grid of holes in the front. On the back there are two sliders in each column, which allow you to mark any of the holes in a column with either a red or a green dot. On the original version there are 28 challenges, given by numbers on the back of the puzzle. Put red markers at the two or three holes that have the number of the challenge you want to do, and then it is your task to place 5 or 6 green markers on the board to form an 8 queens pattern.

Recently the puzzle has been restyled and re-released in a new version. It has 30 new challenges, instead of the 28 that the original had.

The puzzle was invented by Albert Eckhardt and he was granted international patent WO 2006/098614, published 21 September 2006.

Suppose three red dots have been placed. You can place the 5 green dots in 8^{5}
= 32,768 ways, one in each of the remaining columns. If you ensure no two dots lie in the
same row, then there are only 5! = 120 ways to do this. In just one or two of these are
there no two dots on the same diagonal.

If you are solving a puzzle with only 2 red dots given, then there are 8^{6}
= 262,144 ways to fill the empty columns, but just 6! = 720 with no two dots in the same row.

All together there are only 92 patterns of 8 dots with no two on a horizontal
vertical or diagonal line.

If your browser supports JavaScript, then you can click on the link below to play Frustr8tor.

There are 92 eight-queen patterns, but this reduces to only 12 essentially unique patterns once symmetry is taken into account. There are 11 essentially unique asymmetrical patterns (accounting for 88 of the 92) and 1 symmetrical one (accounting for the remaining 4). The twelve patterns are shown below.

17582463

17468253

61528374

41582736

51842736

31758246

51468273

71386425

51863724

57142863

63184275

53172864

The list of all solutions to the puzzle challenges on the current version of the Frustr8tor is currently hidden.
Click to show the list of all the solutions.

The following is a list of all solutions to the puzzle challenges on the current version of the Frustr8tor.
Click to hide the list of solutions.

The solution of one of the challenges on the current version of the Frustr8tor is shown below.
Click to show all the solutions.

1

74__2__861__35__

2

3__5__714__2__8__6__

3

4

42__73__685__1__

5

1__6__8374__2__5

3__6__8157__2__4

6

57__1__3864__2__

7

8

9

6428__5__7__1__3

10

11

12

6__4__7182__5__3

13

52__6__1748__3__

14

8316__2__5__7__4

15

572__6__31__8__4

16

362__7__5__1__84

17

4286__13__57

18

71__3__86__4__25

19

8241__75__36

20

47__5__31__6__82

21

22

637__2__4__8__15

23

24

631__84__275

25

4__8__13__6__275

26

27

5__7__4__1__3862

28

6__2__71358__4__

29

42__85__7136

30

5__14__68273

The list of all solutions to the puzzle challenges on the original version of the Frustr8tor is currently hidden.
Click to show the list of all the solutions.

The following is a list of all solutions to the puzzle challenges on the original version of the Frustr8tor.
Click to hide the list of solutions.

The solution of one of the challenges on the original version of the Frustr8tor is shown below.
Click to show all the solutions.

1.

2.

642__8__5__71__3

3.

4.

57__24__81__3__6

5.

6.

7.

64__7__1__8__2__5__3

8.

9.

8__4__1__3__6275

10.

1__7__468__2__53

4__7__185__2__63

11.

524__7__386__1__

12.

42586__1__3__7__

13.

6317__58__24

14.

51__8__4__2__736

15.

28__6__13__5__74

16.

4__85__31726

17.

6271__4__85__3__

18.

19.

5841__36__27

20.

317__5__82__4__6

21.

6__3__1842__7__5

8__3__1625__7__4

22.

635714__28__

647135__28__

23.

47__3__8251__6__

24.

4__2__8__6__1357

5__2__4__6__8317

25.

615__2__8__3__84

26.

27.

4683__1__75__2__

4753__1__68__2__

28.