That's a great downloadable game called DEFCON, which coincidentally has the coolest subtitle ever; 'Everybody Dies'. That would fit with practically any multiplayer game you can think of.
Buy it. The guys at Introversion Software deserve it.
Can someone else do the next screenshot, though? I can't be bothered rooting through my (sizeable) stack of games.[EDIT]
Wait, I may have the perfect one that I just realised I have. Wait one moment...[/EDIT]