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Instructions for Killer Sudoku

Fill in the blank squares so that each row, each column, and each 3-by-3 block contain all of the digits 1 thru 9.

The dotted lines indicate areas which also contain a non-repeating set of digits. These squares add together to produce the sums shown in the clues.

This Wikipedia article has some useful tips.

Basic Interface

Type numbers to fill in cells.
Use the space bar, 0, or Backspace to clear cells.
Use arrow keys or tap to navigate to cells.

Advanced Interface

Shift-number is a shortcut to mark cells.
🅼 to toggle Mark-mode.

Drag or double-tap to select multiple cells for marking.
Mark-mode is automatic when multiple cells are selected.

Shift-arrow (or 🆂 arrow) for multiple cell selection.
Shift-tap also selects additional cells.

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