Support for games? Not so much. It's why GOG is still my go-to site.

Unreal Tournament on Linux (Mint 17.3) natively!

First up: grab the UT99_451_REV4 patch (which contains Linux compatibility) from here:
https://drive.google.com/file/d/0Bw5Xv02Yq2HrR3lTUTNfbmlqMWc/edit

^props to Ganni1987 for this^

Copy the Unreal Tournament folder (from a previous Windows installation), and ZIP it up.
Backup copy the Unreal Tournament.zip folder to an external media: external hard drive, USB thumb drive, burn it to a CD/DVD...
Fire up Linux (Ubuntu/Mint).
Copy Unreal Tournament.zip to your Linux desktop.
Extract the contents from Unreal Tournament.zip.
Extract the contents from UT99_451_REV4.
Copy the contents from UT99_451_REV4 to Unreal Tournament, overwriting files and merging folders when prompted.
Move Unreal Tournament to Home.
Go into Home/Unreal Tournament and double click ut99_play.sh.
Enjoy!

*If mouse has issues, press Ctrl+G.

To setup a Desktop/Start Menu/Task Bar launcher:

Right-click on your Desktop
Select “Create a Desktop Launcher”
Browse Home folder
Open Unreal Tournament folder
Select ut99_play.sh

You can also use the PNG file to give it an icon and, from the "Other" folder in your Start Menu, pin it to your Favorites Panel and Task Bar.

Neo Geo SNK games on Linux with 2 Gamepads!

For 2 player controllers:
1P Start button
1P Coin button (usually the R Bumper)
2P Coin button (usually the R Bumper)
2P Start button.

Linux heads, y'all are very welcome.