hi molly these are the steps you have to do to play the game u want to download:
1.u have to have a cable to go into the computer for samsung pc studio.
2.download the game u want in jar and jad file(of the same game) to your phone in the other files folder in your phone or memory card.
3.now go to the main display and type in this code: *#9998*4678255# and u shood have a message that says activated then go to your other files folder where u dowloaded the jara and jad file for the game and click options u shood get a pop up saying install? click yes and then u can start the application now or or u will be able to go to your java world then u can play the game.