You get a grid of numbers. Some of them belong to the solution, the rest are decoys. Your job is to decide, for every cell, whether it stays or is crossed out.
- The number on the left of each row is the sum of the cells that stay in that row.
- The number above each column is the sum of the cells that stay in that column.
- In the one island mode, all kept cells must additionally form a single connected shape (touching by sides, not just corners). One island, not an archipelago.
- In the regions mode, the grid is divided into colored regions and each region has its own target sum, shown in the corner of its first cell.
Pick a tool, then tap cells: Keep declares that a cell is part of the sums, Erase declares that it is not. A correct call locks the cell; a wrong one costs one of your three lives and the cell stays open. Under each target you always see the current sum of your kept cells: the target turns green when the line is done, red when you overshoot. Cells whose row, column or region are already complete fade out on their own.
No guessing, ever
Every puzzle here has exactly one solution, and you can always reach it by pure logical deduction, with no trial and error. If you feel stuck, there is always a next logical step: the Hint button will show it to you together with the reasoning behind it, the same reasoning is written out on the daily answer page, and the techniques page teaches you how to find such steps yourself.