Objective: Fill the 9x9 grid with numbers so that each row, column, and 3x3 section contain all of the digits between 1 and 9.

Highlighting: Tap the mini-grid icon inside any number on the keypad to highlight all occurrences of that number on the board.

Notes: Tap the Pencil icon to toggle Note Mode. Tapping a number assigns it as a small corner-note instead of a giant answer.

Winning: Fill every empty cell correctly to win the match!