JudasIscariot: Please send us an email about this as most of our recently released Linux-compatible games should work on both 64-bit and 32-bit versions of our two supported distros.
Contact us here. TheScorpion.282: The game was Duke Nukem 3D, and the solution in ubuntu, gnomeubuntu and probably all other ubuntu variants, was that you have to run a command on 64 bits systems:
dpkg --add-architecture i386
and only then it allowed me to install it. However, I fell kind of annoyed about this kind of things, cause even though you can google the solution, this things should work just out of the box, and I blame ubuntu for that, so I switched to Mint, and there it indeed worked just fine automatically.
About the ia32 libs, that's for old versions of ubuntu. There were a couple of pages suggesting you to install this and that but it didn't work.
I remember Duke Nukem 3D being one of the games I did a quick final test on and I installed it via Software Center and from the tar.gz archive. Maybe I was running it on a 32-bit Ubuntu (I didn't check via the "arch" command) 14.04 but I never came across that message. I would still recommend you send us a note about this occurring so that we can see whether we can make it work out of the box :)