Replying to Small downloadable games?

I started work at a switchboard this week. I only get about 20-30 calls every half hour so I've got a load of time to play around on the computer (Windows 2000), but no internet access. I'm sick of Solitaire and Minesweeper, so I'm looking for some games to download and take into work on CD/disk. Preferably a single .exe file, and small, fast and not resource-hungry because if the computer crashes the phone system goes down and I'm screwed. SkiFree is already on a disk for tomorrow. Anyone know where I could get some more? I remember Win3.1 had a load of small games instead of the 4 or 5 that come with Windows today.