Topic: nintendo 64 problem

Hi I just got the old n64 out and I am trying to use the Perfect Dark game, I assume many other have played it. For some reason it will not let me get to the main menu, it jumps right to the multi player. I know next to nothing about video game systems so any suggestions would help. thanks!

Do you have the Expansion Pak in the system? You need it to play the single-player portion of the game.

oh that makes sense, the game said no expansion pak detected. what exactly is that? my system has a black cartridge in the front of it vertically already.

ok thanks a lot guys, I found an expansion pak I can use and it the game works