If block-balancing games are too bland, advance to this game of arranging irregularly-shaped rocks to replicate the pattern on one of the picture cards. It is best played by a group (up to 5); onlookers can amuse themselves by offering strategies from the sidelines. A nice touch is that each of the 25 cards showing a rock formation to be copied, was named for (but not a replica of) a genuine rock formation whose location and description was included.