1. Select exactly one cell per row and one cell per column.
  2. Choosing a cell automatically blocks out all other numbers in its row and column.
  3. The values of your selections must add up exactly to the target sum.
  4. Timer Mode: Race against a shrinking countdown. Later levels provide less time per cell.
  5. Stopwatch Mode: Solve as fast as possible to claim a spot on the persistent Top 5 Leaderboard.
Mode: None
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