The licensing for the various OS-included games and such change over time. It is possible that the agreement expired and the game is no longer available in the OS level you have chosen to update to. It is also possible that the game was not updated, by the original developer, to be compatible with the OS level you updated to.
Basically, when you do the OS loading steps, if it is not in the list of available components to be installed along with the OS, then it is no longer included with the OS you have chosen to use. You would have to seek out if there are other sources for it or something similar...AppWorld might be a good place for you to look.
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.