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.
Remove the check mark in the "Grid" button and the grid lines disappear.
Remove the check mark in the "Light" button and the color of cells which are illuminated by light bulbs does not change. This is for expert players.
Your settings for these buttons will be saved to preserve your playing environment.
On some computer system the settings may not be saved.
You can enlarge and move the game board with these buttons.
Play using the mouse
Click on an empty cell and you will put a light bulb.
Clicking on a light bulb changes it to a "dot." This will remind you not to put a light bulb in this cell.
Clicking on a "dot", the "dot" disappears and the cell becomes empty.
Clicking the left mouse button changes a cell like shown here, to the left.
You put light bulbs one by one. Click on a bulb and drag (move the mouse pressing the left button), and you can put "dots" continuously, but bulbs you drag across do not change to "dots". Click on a "dot" and drag to delete bulbs and "dots".
When you complete putting bulbs and "dots" around a number, click on the cell number and the color will change. This will help you to solve the puzzle better.
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 "Congratulation." 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," bulbs and "dots" change in the opposite order.
You can also drag pressing the "Shift-key. " That way you can put "dots" continuously, this is very convenient.
How to use Try-mode
When you want to put a light bulb or "dot" 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 point 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.
