Any games I can play at work?

Help me. I need to find a game that takes me 8 hours to beat. My problem is that I can't download anything on my work computer. We're on a network and I dont have the authorization to download, so I can't get an NES emulator. I don't think I have flash either.

Anyone know good sites to play some games?

Thanks.

I work at a hospital. All of the psychiatrists here apply to the National Institute of Mental Health for money for grants to do research. I'm basically the liason between the psychiatrists and NIMH. Good look on the games though - I hope I can find Punchout.