It's a popular Japanese math game commonly found in newspapers and publications with related games (crosswords, etc.)
On online message boards, particularly 4chan's /v/, people mix the word for Japanese ritual suicide, "seppuku," with "sudoku." The typo has since spread and became adopted in a similar fashion to "pwn" in regards to "own."
"If you seriously gave EA your money for that piece of sh*t you should just commit sudoku."
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