Knockout 
            and Reveal encourages visual development and prediction. 
          Users 
            can either assemble or knockout pictures piece by piece; pictures 
            can be uncovered or revealed in amusing ways - try 'snaking' for an 
            intriguing effect. 
          An extensive 
            library of images is provided and users can also load their own pictures. 
            The program is useful to students with cognitive and developmental 
            disabilities and can be accessed by touch window, mouse or keyboard. 
            
          Input 
            methods: Touch Screen/Mouse.