This is an example puzzle. You can solve it the same way as you would solve competition puzzle, but result never stored. You can reveal an answer for the puzzle by clicking "Show answer" link.

Author: Andrey Bogdanov

Place a number from 1-N in each empty cell in the grid such that each row, column and marked area contains each number exactly once. The clues outside the grid indicate the sum of the first X numbers placed in the corresponding direction, where X is equal to the first number placed in that direction.

**Grid control**:
Click at a cell reveals the value chooser. Click at the selected value changes the state of the cell.
More details about grid control are at the help page.