Any Good LAN Games Under 50 - 100 Meg?

[Bobomoomin]

Hey, My school is letting me and a few friends of mine have huge LAN games during lunch times! :D Does anyone know any good LAN games that are under the 100Mb mark once installed? The computers we are playing on are pretty ok (2.8Ghz Intel's from Dell) but playing with onboard graphics so no high spec games please!

Also are there any fun LAN games other than first person shooters and racing? Freeware games are even better, but please do suggest other games aswell as freeware

Note: Being under 100Mb Isn't essential, but 250 is about the max!