Whats wrong with my laptop?

I have a MacBook laptop purchased in 2009 so it is relatively new. I spilled a little bit of water on it about a month ago. The numbers on my keyboard work and so do all of the top buttons but most of the keys on the keyboard dont work. When I start a game though (The Sims 3) my keyboard works in the cheat bar so I know it recognizes the buttons that I am pushing. Also it makes a beep sound when I press the buttons. Is this a software problem or will it require a hardware repair?