That's why I still keep a dual-boot so I can use Windows if I need to. Saying that, Wine (Linux windows emulator) has gotten markedly better recently, and more games are coming out with Linux versions. 99% of humble bundle games have Linux versions. Battle for Wesnoth is a great turn-based strategy game that's free on Linux. You can probably get it free on Win too, I think there's even a mobile version for free.
I somehow managed to throw out my Windows 7 disk with a bunch of boxes

so I guess I will be 100% Linux when I have to format my hard drive.
The difficulty in learning is not acquiring new knowledge but relinquishing the old.