THIS intriguing puzzle will test your ability to think logically. On the screen are two 3x3 grids and you must make the one on the right match the target pattern on the left. If you manage It, there are two more for you to have a go at. To make things more challenging there's a time limit of one minute on the first level and even less on subsequent ones. The idea is that the keys 1 to 9 on the numeric keypad correspond to the squares in the grid. Pressing a key reverses the colour of that square, plus others based on the following rules: The corner keys - 1,3,7,9 - flip the colours of the four squares in that corner. For instance, pressing 7 reverses the squares corresponding to 7,8,4 and 5. Keys in the centre of an edge -2,4,6,8 - flip the three squares on the edge, and the centre key, 5, switches the five squares which form the central cross. You can only change colours when the key you press matches a black square. If it's orange, nothing will happen. Of course if you inadvertantly turn the entire grid orange, you can't go any further and will have failed in your task. The program will detect this and give you the option of restarting the game. The data that defines the starting position and shape of the targets is clearly marked at the end of the program, so you can easily create new puzzles when you complete this one. In the target data each row is a level and the first three items are the first row in the grid, and so on. Good luck. Nobody here has managed it yet without cheating! CWTA | 
