Zelda: Four Swords

Finished the first stage (silver keys) of the game after 5:44. In that time I beat several stages twice. Once on single player, the second on two player. There were a couple times that I accidentally quit the game and had to do a stage again while on single player. 

Even if at times the game is frustrating it is over all fun. It is a game that you could easily play for hours and lose track of time. 

Multi players adds to the game because it's more competive. This actually makes it a tad more fun than if you played alone.

I think the biggest plus when playing with a friend is that you are in good company when you make stupid mistakes. You laugh instead of getting frustrated.