Valve Software developing for linux

When I was using Windows, I used to play lot of time-killing games. After switching to Ubuntu, I could not find those games. Some of those linux games were not as good as those windows games. I could try playing via Wine, but didn't.

So, my productivity has increased now. Most of time is devoted to fixing bugs, trying to increase passive income, trying to get some certifications etc.,

Still, I miss those games... AoE, Thief Series, HL, Diablo...

Steam and Adobe are the only reasons I don't use Linux. I would love to make the switch otherwise.