Final answer:
The question seems to relate to a narrative in which a character named Stanley has a sudoku puzzle solved accidentally by another character. Specific details can't be provided without additional context related to the story or the source material.
Step-by-step explanation:
The question 'Who does Stanley's sudoku by accident?' refers to an event from a work of fiction, likely a novel or short story, where a character named Stanley has a sudoku puzzle that is completed by someone else by accident. Sudoku is a logic-based, combinatorial number-placement puzzle, often featured in brain-teaser sections of newspapers and magazines, but the context of the question revolves around a narrative situation rather than the mathematics of the puzzle itself.
As such, without additional context, it's not possible to provide a specific answer. However, if this question relates to a known story, book, or film, please provide that context for a precise answer.