Maybe the best way to earn Bitcoins is to play games. I've seen that you could play games such as Minecraft, among many others and earn some Bitcoins. Is it really worth to spend time playing these games to earn some coins? 
Unless you like the game, I think it won't be worth it. You better invest a few $$$ and get some bitcoins directly..
No need to invest too much if you don't have a lot of money.. Just get a "part of a bitcoin" then