First Game I played on Linux:
Quake, back in the late nineties on RedHat 6 if I'm not mistaking :D.

First game that I purchased:
No idea...

Last game I purchased:
Ravensword: shadowlands

Last physical game I purchased:
Skyrim. Not a linux game, but I don't think I've ever bought one of those on physical media.

Next purchase:
Maybe total war: rome II, maybe tropico 4 or maybe something else entirely, we'll see

Free game that I'm still playing:
None at the moment really, have played some TF2 some time ago.

Unless you insist on having every graphical effect turned on Xonotic does not scale that bad, at least in my experience.

First Game I played on Linux:
Frozen Bubble or XMoto... I can't remember... but it was on SuSe Linux around 2002 or 2003

First game that I purchased:
Some weird 90's inline skating game from a budget table. Was incredibly crap and ugly.

Last game I purchased:
Natural Selection 2 ... only to find out it won't run on an Intel HD 4000 because of driver issues.

Last physical game I purchased:
Diablo 3

Next purchase:
Rust or Starbound unless some weird sale has something better to offer :D

Free game that I'm still playing:
Dota 2

First Game I played on Linux:
I think it was TeeWorlds :D

First game that I purchased:
Bastion it was, I bought it at steam not Ubuntu software centre.

Last game I purchased:
Natural Selection 2

Next purchase:
No idea, really. :D

Free game that I'm still playing:
Dota 2

First game? Likely something included in the distros back in 2000... Couldn't tell ya what. But my first commercial game was Doom. I got it working on pretty much every distro and OS I tried back then, even BeOS (though I can't recall if QNX ran it or not).

First game I purchased, specifically for Linux? I dunno for sure. I checked my PayPal history and I see my first TuxGames order on Dec 8 2002 for $130. Can't recall what that was, as I made a lot of orders in the early days. But that wasn't my first purchase, because I bought Neverwinter Nights on launch day, summer of 2002 (and then waited for 9 months for the promised Linux port...). However, I know for a fact that I bought several Linux games late 2001-early 2002 at retail locations, before NWN released, including Loki's Quake 3 Arena in the silver tin and Terminus. But I do believe that my very first Linux purchase was Eric's Ultimate Solitaire, which I have installed as recently as November last year... I remember I paid $4.99 at EB Games for it and the manual was humorous.

Last game I purchased? ArmA Tactics. The only game with a Linux port in this week's Humble Weekly Sale.

Last physical game I purchased? For Linux - Sacred Gold in 2009, from TuxGames. For other platforms (PS3) - Beyond: Two Souls, or bargain-bin Crysis 3, I forget which.

Next purchase? If nothing new releases or goes on sale before then, Octodad: Dadliest Catch. Really trying to limit my non-Linux game purchases, as my PS3 and Vita backlogs are quite big, and my Linux library is growing practically daily.

Free game I still play? Umm, The Dark Mod, though "still playing" implies a longer history than I have with the game.

What's the first game you played on Linux?
I've already had Unreal Tournament 2004 and this was my favorite game back in those days. And even more important thing is, I agreed to be a linux user because of this game.

What's the first game you purchased for Linux?
H-Craft Championship was the only one game I could buy then. Even though I wasn't a big fan of that kind of game, I bought it. That was a great feelings to buy a native linux game. I know, that sounds funny now.

What's the last game you purchased for Linux?
I've bought Not The Robots today.

What free Linux game are you still playing?
Free episodes of Commander Keen. I still love those games.

What's the first game you played on Linux?
probably some games that came with (open)suse and kde back in the 2000 . but first "real" game was probably Savage 1

What's the first game you purchased for Linux?
ET:QW if i remember correctly

What's the last game you purchased for Linux?
uhh..thats a hard one.. cause i buy a lot... last one was probably Little Racers STREET

Whats the next game you will purchase for Linux?
probably Project Zomboid if multiplayer gets into main branch.. but if there will be something good and new before ...then i will buy as well

What free Linux game are you still playing?
Xonotic, Unknown Horizons and sometimes openRA

What's the first game you played on Linux?
Not sure, but I think it was Chromium (the shoot'em'up, not the browser ;)).

What's the first game you purchased for Linux?
Quake: The Offering - the huge cardboard box for the special Linux edition of Quake. Still proud to own that to this day.

What's the last game you purchased for Linux?
Hmm... It was either Race The Sun or The Powerpuff Girls: Defenders of Townsville - I tend to buy anything with a good review and a Linux version so I'm not quite sure which was the last.

What's the next game you will purchase for Linux?
Hopefully The Witcher 2.

Which free Linux game are you still playing?
None.

The first game I played on Linux was Warzone 2100, having played the original 'way back in 1999.

The first game I purchased was Neverwinter Nights Platinum, at a very good time; I'd played the Windows version since 2002 and 2008 was when BioWare put out the enormous 1.69 patch, and was native Linux!

The last non-Bundle game I purchased for Linux was Europa Universalis IV.

The next game I will purchase for Linux? I have already downloaded all but the executable for Witcher 2 (the executable is still in beta); I bought X-COM: Enemy Unknown last year, and it's coming out (it says here) this summer; and what I am most hoping for is a native version of Skyrim.

I was noticeable a year ago for saying 2013 would be The Year Of Linux Gaming. 2014 looks to be closer to the mark...

PS--I do still play Battle for Wesnoth, 0AD, Warzone 2100.