A digit belongs only when the surrounding grid permits it.
WHAT IT FEELS LIKE
You do not have to guess a secret word or rely on trivia. Each placed digit is a consequence of what the rows, columns and boxes already allow.
The board provides no vocabulary or trivia hints. Instead, everything follows from the numbers already placed. A digit excluded from most cells in a row may have only one possible location, while a box rules out candidates elsewhere. Pencil notes keep tentative options visible without committing too soon. The rewarding moments are small deductions that open the way for another, rather than dramatic leaps to an answer.
HOW IT WORKS
The nine-by-nine board is constrained in three overlapping directions. Pencil notes let you track candidates without committing a number, and the selected-cell highlights help inspect related squares.
IS THIS FOR YOU?
For players who prefer deduction without English vocabulary. The full grid rewards sustained attention, especially when several candidates remain plausible.