In Donkey Kong 64, you get an expansion pack, which already makes the game a good buy, but the game is huge.  It takes hours to complete, so I wouldn't recommend it for younger kids, but the gameplay is great.  There  are five Kongs in this game: Donkey, Diddy, Tiny, Lanky, and Chunky.  All  of which have different powers which are needed to earn Golden Banannas to  unlock levels.  Besides the game's challenge, You also need to complete two  classic Rare Games: Jetpac and the original Donkey Kong.  This game  supports an OK multiplayer, but it is not as addictive as the game, and the  controls would be to confusing for someone who is not familiar with the  game.  All in all, this game is a good buy.