Best games for portable drive? freeware, classics, emulators! :)

Hi all, I have a couple of questions about PA gaming, so I'll just dive in!..

1: Anyone who plays snes/nes emulators: do some games play with only the mouse? I like to play a little game while at work to take a break and clear my mind. This actually increases my productivity, but I don't think it would be appreciated if I unrolled a gamepad in my cubicle 3-10 times a day. LOL!

2. Does zbattle work with emulators run off your USB? Does zbattle (or any alternative) work and/or is it worth it?

3. I'm looking for a fun, skill oriented game, with decent graphics that I can run windowed off my USB drive. Sports, strategy or action genre preferred. Something I can just click onto when I get stumped for a few minutes. Something I can just dive into, then leave! Anyone got any suggestions.

4. Also, just thought I'd mention. I got all the old, kick ass Black Isle games (Fallout 2, Torment, Icewind...) to run off a USB without too much work! Any other classics/great games anyone else get to run?

thanks for your input all!