Once you have entered the pattern editor (See "Creating a Pattern"), you can add, remove, or move tiles in the pattern.
Notice that each tile takes up 4 squares of the grid. To place a new tile on the grid, click in the upper-left of the 4 squares that the tile will occupy. Likewise, if you wish to remove a tile, click in the upper-left quadrant of that tile.
If the computer beeps at you when trying to remove a tile, it is probably because you were not clicking in the upper-left quadrant.
If the computer beeps at you when trying to add a tile, there are a couple of possible reasons. One is that the tile you are trying to add would overlap an existing tile on the same level, which is not allowed. Another possibility is that there are already 144 tiles placed in the pattern (the number of tiles placed is shown at the bottom of the screen). You must remove a tile before adding a new one in this case.
To change to a different level of the pattern, click on one of the radio buttons at the bottom of the screen, or just type one of the numbers "1" through "5".
When you are happy with the pattern you have, and all 144 tiles are placed, just click the "Save" button at the bottom of the screen. You will then leave the pattern editor, and your new pattern will automatically be chosen for the next game.
