A series of seemingly ordinary desk-resident objects - the sort that would seem to be appropriate to have on a desk - but formed in such a way that they topple easily. These objects can be placed in an approved formation on the desk either side of the mouse cable, and are actuated by the mouse cable nudging against them in normal mousing usage.

The objects each have a score value, and the object of the objects is to knock them all over in one mousing action, if possible - hence the skittles bit in the title.