
            
Each level starts with the shells opening and displaying their contents (colored balls). The shells then close and you must click on the matching pairs of the same color.
            
Time The Shells Are Open
            The length of time in milliseconds that the shells are displayed open before closing and hiding their contents.
 Time The Matched Pairs Will Display
            The length of time in milliseconds that the correctly matched shells are displayed open before closing and hiding their contents again. 
Mouse
            Click the mouse on a shape  to select it.
Keyboard
            Playing Using Keys Press the cursor (direction) keys to move through the selection of tiles then press the SPACEBAR or ENTER/RETURN key to make your selection.
Single Switch Scanning
              Playing Using Keys Press the cursor (direction keys to move through the selection of shapes then press the SPACEBAR or ENTER/RETURN key to make your selection.
              NOTE: If you choose "Mouse Click Only (Scanning)" then a large green button will be displayed below the Game Menu and below the Game. Your mouse cursor must be positioned over the large green button while scanning for the mouse/switch clicks to be detected.