Unreal Tournament 2004
Hard To Believe this hasn't already been in the Budget section - all the others have been - but even though UT2K4 has been available on Steam for $11 for a while now, it's just been stamped down to $6. Of course, it's going to look dated, but the only thing that matters when judging a UTgame is whether the action is smooth and frantic, and UT2K4 has that in spades.
For the game that gave us the Onslaught mode, introduced vehicles onto the battlefield, and nurtured its modding community with a generous toolset and the Make Something Unreal competition, five quid is a pittance.
It's two quid cheaper than the Red Orchestra mod, which won that competition and ascended from the development pot of moddb.com and onto retail shelves. UT2K4 is basically a defining PC game, and one that any gamer who's over seven years old is likely to have.
The problem is, of course, that anyone left playing UT2K4 is going to be hardcore about it, so online matches will see you getting a fair share of your arse delivered immediately back to you. But still, UT is all about dying quickly and getting back into the action. You're bound to land a lucky kill before the round's up, so give it a whirl.
And lest we forget, UT2K4 was also the game that introduced online activation and SecuROM, which makes Epic the bad guys of years gone by. So, boo. Except for the modding community stuff you did. Hooray for that. And for the game too.
Download Unreal Tournament 2004
PC compatible, P-100
Systems: Windows 9x, Windows 2000 Windows XP, Vista, Win 7, Win 8, Win 10.
Game features:Single game mode