Doom 1 and 2 don't. Also very tiny filesizes. Mainly go for pre-2000 stuff as most of that stuff just runs as an exe now.
They are offline games. You'd expect that a lot of the websites people have posted for online games would be blocked on a work laptop.
I might also suggest looking into emulation; DosBox, VisualBoyAdvance [VBA], and ePSXe emulate DOS games, gameboy games, and PS1 games respectively. Note that the emulator programs themselves are not illegal, but I'm not allowed to tell you where to find the games for them. Just look.
This post was edited by Razzattack on Aug 11 2011 07:45pm