Wallamoppi, a dexterity game published by Out of the Box Publishing, was on display at the joint Out of the Box / Rio Grande Games booth at Gen Con 2006. Players take a disc from the bottom of the stack and add it to the top of the pile, building it higher and higher until it finally collapses.
The twist is that the game box also works as a timer. A marble is placed in a hole at the top, and if the marble makes it all the way down the track before a player can put his disc on top of the stack, he loses the game.