Anyone remember how to play Donkey Kong 64? Help!?

Okay, I think we used to have the player's guide, but I have no idea where it is now, and my kids have found the 64 and are stuck playing Donkey Kong. They need to find the way into the Factory level. I'm thinking they've done all they can do in the Jungle Level and Aztec Level, so we can't figure out where they need to go to find the next level (the Factory).