Help about Samsung Marvel

I have Samsung Marvel S5560 Phone I have couple of things to ask.

First Problem is I can't set Full Screen Wallpaper on my Phone When I choose picture set as wallpaper phone setting shows me select the size of picture but I can't select full size of wallpaper I download many wallpaper for my mobile with the exect size but problem is same.

Second Thing I need Good Official Samsung Games for My Mobile How Can I get it ?
I search many sites for that but not find good games for my mobile.

Thank You!

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What do you mean by 'full size of wallpaper' ? Does it crop the image when you set it as the wallpaper?