72 pin ..... There's absolutely no soldering necessary to fix the nintendo. You remove the top part of the case, the rf shielding inside, the motherboard from the bottom of the case, and the old 72 pin connector from the board. The new connector goes in eaasily. all you need is a phillips screwdriver. There's actually a fix for the original gameboy as well that doesn't require soldering, but for almost every other system I've seen the game connector is soldered to the motherboard and is a pain to deal with... stick with the nintendo!