Scramble!

This is basically a two-player version of the 1970's game Perfection, in which you have a set of plastic shapes that fit into holes on the board. The board is pushed down into a spring-loaded box with a timer. When you fit all your shapes into the right holes, you turn off the timer. If you don't turn it off in time, it pops and sends all your pieces flying.

Scramble! is exactly like that except each player has his own set of pieces, and you play on opposite sides of the game unit. There are 18 pieces for each player. The game also includes a "junior version", which amounts to a piece of cardboard that covers up six of the holes.