Sand Slides is a game for the iOS developed by Logik State. Released in 2010, the game requires the player to draw slides in order to direct sand into different buckets. The snag is that the sand comes in a number of colours, and must be corralled into its corresponding bucket in order to earn points.
As the sand drops faster and faster, it becomes increasingly hard to direct it all to the right place- and every grain counts. At £1.65, the game has proved a fairly popular choice- and its page on Facebook has a following of around 700.