Windows Free Full Version Games!

Hey I'm new to this OS but I'm very excited to play some cool xbox games but I recently found out that almost every single one of them were Paid version.
So i thought to buy them with my phone's balance but instead it opened up a credit card dialogue box.
Can anyone help me to find out free games of Windows mobile 8 - LUMIA 620!!
some of them are :-
1. Plants vs. Zombies
2. Fruit Ninja
3. Asphalt 7 : Heat
4. I Skate 2

I don't understand... you wanna buy pirated Xbox games on your phone..?

Thing is, what I know for Android won't work on Windows...

Hello,

You want those games for your mobile phone?

Windows 8 has a new sort of "app": Games and Store where you can download games like it in the Apple Store, or Android store, you download the games from the store and you can play it, the games are like the Ipod touch or Android games (Jetpack Joyride, Angry Birds series, etc...)

invalidusername wrote:I wouldn't recommend getting any of the "touchscreen" games for your computer, unless it is a touch screen. That just adds in a whole new level of complication. (And the games from the store usually run like crap anyways.)

Tried out Jetpack Joyride on my computer, got boring pretty fast, as you can do much more on a computer (Better games than iTouch) than play "arcade" games meant for a touchscreen.

The thing is I was asking How can I get pirated version of games and apps in free, running in my lumia 620! 
Sorry for asking in a misleading way!