Ruin "Sudoku" puzzle has two valid answers, game only accepts one.

[MindCollaps]

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For this puzzle, either the yellow OR the purple 1 dot could be in the question marked square. There are two valid solutions to this specific puzzle (Which should not be the case for any properly crafted sudoku puzzle).

The two valid solutions to the puzzle are:

P1, B4, Y2, R3
B2, Y1, R3, P4
R3, P2, B4, Y1
Y4, R3, P1, B2

P1, B4, Y2, R3
B2, P1, R3, Y4
R3, Y2, B4, P1
Y4, R3, P1, B2

Where B = Blue, P = Purple, R = Red, and Y = Yellow, obviously.

As you can see, both are valid, and the worse part is that both P1 and Y1 are options the game gives you for the answer, so you can't narrow it down that way either. I picked 1 yellow dot, and it gave me a fail.

[RuthMorrisonMR]

Good to know.

[Carlff]

That is really interesting, but I can't really imagine everything in my mind. I think that I need to create the same situation on the virtual table. Anyways, it was expectable for me with that yellow dot, there should be another solution to solve this. I wonder if there is an automatic solver on the internet, it could be times easier to make it. Like word unscrambler which I always use when I play with my kids. I'm kinda dumbass and I feel ashamed when I see that my kids know times more words than me haha. So, this things is pretty cool to use if you want to win.