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.