Here is a 4 Square pinball machine for sale. This is a classic collectible Gottlieb wedgehead pinball machine. It features 4 numbers that you must complete 4 times to light special. Once you light special, there are 4 targets that will give you a free game. You can hit them many times and really rack up the games. The Bally Kiss pinball had a similar feature with the 4 X 4 grid.