yes it is possible to download the games in galaxy gt.
There are two ways for it.
First method goes like this.
Open your PC & conect to internet. Go to www.getjar.com
Download Java games (games having .jar extension )for Galaxy gt mobile phone on your computer.
1. Create a new text document(on desktop right click > new > text document)
2. In that paste this.
#Write ur application/software/game name in the space provided.
#Here operamini.jar is name of the application/software/game that is going to get installed.
#Remember that the name of the application/software/games should be same with that u write here.
#If your .JAR file name is gamename
i.jar then in the space provided you should type gamename
3. Now rename that file to abc.html and copy both the files (''abc.html'' and the file you want to install) to a folder via Cable to the phone.
4. open abc.html in ur phone and the file you want to install is installed
Second & easy method goes like this.
You must have a working GPRS connection on your galaxy gt.
Open the cell phone menu, connect to the internet via GPRS and type the url::
install operamini on your cell when it prompt so.
No go to the games menu, select opera mini browser and it will show "free applications"
click on it and it will list free games and applications for your cell. Click on the ones you want to, install and run.