Challenging Sudoku Puzzle
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The Challenging Sudoku Puzzle is a furniture in Arknights. It is part of the Detective's Study theme.
Description
Used in the dorm to improve the ambience.
An extremely difficult sudoku puzzle that has given the detective trouble for quite some time now. She can often be seen thinking long and hard about it, but her inability to solve it is actually because of a misprint changing an inconspicuous number.
Acquisition
The Challenging Sudoku Puzzle is available at the Furniture Store for 135 
Furniture Part or 1 
Originite Prime since The Rides to Lake Silberneherze.
Previously, it was only obtainable as possible Lucky Drop from What the Firelight Casts until The Rides to Lake Silberneherze.