You could simply buy the game with cash or through your bankaccount. Or for example with PayPal, so with normal currency.
I use to buy (desktop) games with Bitcoin too. There are some great parties here on Bitcointalk that offer such service, very fast and userfriendly, like
SteamBitShop (which is for Steam games thus).
However, with the current value of BTC I don't do this often anymore. That's actually quite strange; yes you have to pay more BTC for a game, but you can buy new BTC with less money. I think it is just an idea that you don't want to spend much of your valued BTC
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
(I do have that feeling. Spending 0.05 BTC on a game, OK. But spending 0.20 BTC on a game, that's not a great feeling).