This shows the screen when you start a problem. The bottom-right timer starts when you open the problem.
This is the solving mode so you can start right away.
Generally use the left mouse button. Using the keyboard with the mouse makes operation smoother.
Change the line width of the game grid here.
Check the "Number" button to display numbers outside the game grid.
Clicking on a blank cell and dragging lets you blacken several cells. When dragging the cursor, blackened cells other than diagonal cells will not touch.
Remove the check mark in the "Grid" button and the grid lines disappear.
This changes the mark in the cells that do not become black.
Your settings for these buttons will be saved to preserve your playing environment.
On some computer systems the settings may not be saved.
You can enlarge and move the game board with these buttons.
Play using the mouse
Click on a white cell and the cell becomes black.
Click on a black cell to show a mark for it not to become black (here the mark is a "circle").
Clicking on a "circle", the cell returns to white.
Clicking the left mouse button changes a cell like shown here, to the left.
Click on a black cell and drag (move mouse pressing the left button), and you can put "circle" marks continuously, but black cells you drag across do not change. Click on a "circle" and drag to delete both black cells and circles.
Look at the example to the left to see how dragging works.
When you start dragging from a cell (see below), only cells become black. When you start dragging from a cell, only cells get black.
Click on a black cell and drag (move mouse holding down the left button), this lets you put "circle" marks, but black cells do not change. Click on a "circle" and drag and you will delete both black cells and circles.
When you want to start a puzzle again click the "Clear" button. The timer does not return to zero though. To reset the timer you have to close the problem and open it again.
The members page counts the number of times you open a puzzle.
When you want to redo a step, click the "Undo" button. By clicking this button repeatedly you can return to the start.
After solving a problem, click the "Check" button. If your solution is correct the screen will say "Congratulations." If your solution is not correct it will indicate one point that is not correct, click the "Continue" button to continue to solve this puzzle.
Using the keyboard with the mouse
When you click the left button of the mouse pressing the "Shift key," black cells and "circles" will change in the opposite order.
You can also drag pressing the "Shift-key. " That way you can put "circles" continuously, this is very convenient.
How to use Try-mode
When you want to make a cell black or put a "circle" temporarily thinking about the next step, use Try-mode. Click the "Try" button and the screen changes to Try-mode.
With the Try-mode, you can solve problems just like in the regular solving-mode. Your first action is indicated as brown and the following yellow.
Click the "Delete" button in Try-mode, if you want to delete your trial actions. All your trial actions disappear and the cell of your first action is indicated by yellow blinking corners.
Click the "Fix" button in Try-mode if you want to set (make permanent) your trial actions. The color of all your trial actions are changed to black and you return to the solving-mode.