Use every clue to combine row, column, box uniqueness with dashed cage totals; the shipped board has exactly one checked solution.
Killer Sudoku overlays dashed arithmetic cages on a four-by-four Sudoku. Each row, column, and two-by-two box must contain one through four exactly once, while the digits inside every cage add to its printed total without repetition. A cage may cross a box boundary, so arithmetic and placement rules must be combined. The shipped puzzle is accepted only when a bounded backtracking search finds exactly one full Latin arrangement.
Choose a white square by tapping it or moving the gold cursor with the arrows. OK, Space, and Enter rotate through blank and digits one to four; Reset restores all givens and cage outlines. Thick grid lines separate boxes, while dashed borders and a small corner number identify each cage. Fixed entries cannot be changed, preventing an accidental edit from invalidating the original clue set.
The progress display counts values that agree with the unique grid, and score bonuses are awarded when a row, column, box, or cage becomes valid. Repeating a digit or exceeding a cage total never ends practice, because the mark can be reversed, but it does not increase progress. Solving all sixteen squares adds the completion bonus and records the best score locally for later attempts.
Start with single-cell cages and extreme totals. In a four-cell alphabet, a two-cell cage totaling seven must be three plus four, whereas a total of three must be one plus two. Then use box exclusions to decide their order. Before committing, ask which digits are absent from the row and column as well as which combinations remain in the cage; no one rule should be considered alone.
Mobile buttons meet the forty-four-pixel target and keep fingers away from small cage labels. Landscape uses the dynamic viewport, while portrait centers the square board below the HUD. The debug driver enters certified digits but resets instead of freezing on a solved screen. render_game_to_text exposes cages, fixed cells, row and box conflicts, completion percentage, cursor, score, and the two-solution cutoff result.
Start with single-cell cages and extreme totals.
Mobile buttons meet the forty-four-pixel target and keep fingers away from small cage labels.
Killer Sudoku: The progress display counts values that agree with the unique grid, and score bonuses are awarded when a row, column, box, or cage
Use every clue to combine row, column, box uniqueness with dashed cage totals; the shipped board has exactly one checked solution.