To make a slightly safer version of giant Jenga, don’t build the tower from heavy wooden pieces. Instead, make pieces from cardboard boxes. Those cardboard sleeves that hold 12-packs of soda will do nicely. Just make sure they don’t have any parts that stick out, as they could snag on other Jenga pieces. It might also help to weigh down the boxes a bit—try taping a few washers inside, making sure to distribute them evenly.