The Collaborative International Dictionary of English v.0.48:

Tiddledywinks \Tid"dle*dy*winks`\, n.
   A game in which the object is to snap small disks of plastic,
   bone, ivory, or the like, from a flat surface, as of a table,
   into a small cup or basket; -- called also tiddlywinks. [U.
   S.]
   [Webster 1913 Suppl.]