Example puzzle
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.
Gaps
Author: Andrey Bogdanov
Place two circles in every row/column. Cells with circles should not touch each other, even diagonally. Numbers outside the grid indicate the number of cells between the circles in that row or column.
Grid control: Click the mouse button at the selected cell to set/remove a circle. You can use mouse dragging to copy content from one cell to another. More details about grid control are at the help page.