A game where(usually) involves things like sand, oil, water, and such falling from the top of the screen, in some versions, you can stop it from falling, and make various other things appear, like walls, a little rotating
thing, and fire. The game often has very realistic
physics, and can be entertaining. No one really knows where it originated, and many similar games are around, like "powder game", one without falling things, and MANY different objects, such as
ant, magma, virus, fan, and
bubble, and little men called "fighter". some of which are in "falling sand".(there are many versions of this game, most being in Japanese.)
I was playing that falling
sand game, and
made some burning oil, then I clicked this weirdly named
thing, and a ball started rolling around.