Two is usually better than one because it's two times the power, the intelligence everything is doubled but it all depends on your partner abilities, the information I gave you know applies to this game and to real life. In the game you can choose a human person to play with you or the computer.
When I was young I used to love playing "Xonix" that is a game you have to capture the ball with lines, since then so much changed in technology and designed, I was completely stunned to play this game, it's so realistic and takes place in a city, don't take me wrong- I still love Xonix it's very nostalgic to me but now at 2010 no wonder people spend a lot of time on these games and don't go out of the house, this specific game is Amazing!