How to play
Circle the numbers that add up to each total. Erase the rest.
- Every row and column has a total on its edge. The
numbers you circle in that line must add up to exactly that total.
- Each coloured region has its own total, shown in the small badge at
its corner. Regions overlap rows and columns — they must all work at once.
- Use the Circle / Erase toggle at the bottom, then tap cells. Drag
across several cells to mark a run of them at once.
- Tap a cell again to clear it. On a desktop, right-click applies the
opposite mark without switching modes.
- A total turns green once its line is finished, and
red if you have circled too much.
- Every puzzle has exactly one solution, and can always be reached by reasoning —
you never need to guess.
Where to start
- Erase any number larger than its row or column total.
- If a line's total equals the sum of every number in it, circle them all. If some
number can't fit in any combination that reaches the total, erase it.
- Small regions are the best way in — a region of two cells totalling 12 with a 5, a
7 and a 9 in reach resolves immediately.
- Stuck? Hint finds the next square that logic settles, and tells you
which line proves it.