Twidgets are each filled with different colored balls (one blue, one green and one purple) and different amounts of fill (90%, 60%, 30%) as well as a one highly visible yellow ball to track from side to side. The reward is the popping noise made as the yellow balls passes from one chamber to the other. Each Twidget has a loop for attaching on your own key chain.
Blue-level-hard-more effort required
Green- medium level
Purple- easier-less strength required