There are themes that when downloaded initially on a new phone will rearrange icons, applications, games, etc. To be able to find the icons you are missing, please follow these steps:

1.    Click on the application button it will take you to your grid screen.
2.    Click on the application button again
3.    Select Show All should display any and all folders that might have been hidden

If you are still unable to find that games/applications that you have purchased, attempt to locate them in your downloads/games/applications folders. You may need to use your application button once you are in those folders to Show All hidden folders/files. Once you have located them you can move them to the folder of your choice.