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.
Masyu
Author: Andrey Bogdanov
Draw a single closed loop which runs horizontally or vertically between the centers of the cells. The loop cannot intersect or touch itself. The loop must visit all cells with circles. In a cell with a black circle the loop must turn by 90° and must travel straight through the previous and next cell. In a cell with a white circle the loop must travel straight through and must turn by 90° on the previous or the next cell.
Grid control: To draw a line press the mouse button at a start cell and move mouse to another cell holding the button. More details about grid control are at the help page.