World of Sand and its later versions are sandbox type games. The game involves four different particles falling from the top of the screen, which all look and move similar to sand: sand, water, salt, and oil. Each of these elements have properties that can be manipulated, such as burning, desiccating, growing, and eroding. Along with these four, additional elements can be placed on the screen with the mouse, some that are solid and stationary instead of flowing. By mixing the different elements together, many colorful designs, complex structures, and systems can be created. There is an additional feature in some versions called the namekuji. In Japanese, "namekuji" means slug. The namekuji also has some unique properties.