Two physical objects cannot occupy the same space at the same time. Two virtual objects can, but they prefer not to.

Circles, half-circles, and blanks on the purple layer. Circles, half-circles, and blanks on the yellow layer. Just enough pieces to fill the board with full circles.

Swap, Spin, and slide the two layers against each other to create a full set of circles. 100 built-in boards plus three levels of difficulty will keep you busy for a quick game or for hours on end!