Players build from the two "foundation" blocks attempting to create an unstable structure that will force the other player(s) to cause it to collapse while not doing so themselves. The stucture is "collapsed" whenever any piece other than the "foundation" blocks touches the tabletop. Since there are limited pieces, players must make the structure become precarious quickly in order to win before the game becomes a draw from lack of pieces.
It is a lot of fun to play because it can either be very strategy intensive, for the expert, or just a pastime, for the average player. Changes in the arrangement of the "foundation" blocks changes the difficulty and type of structures. It can even be played alone to set records of highest tower or most pieces. It is incredibly versatile.
I am planning to begin building game sets and probably selling them on Etsy. I'll add a link when I'm ready.