I have not used too much lately my Prime. I have been mostly focused on the HP41CL, but the other day I went to the site hpcalc.org , which has a site with software for graphical HP calculators, dating all the way to the 48 series, 39, 40 to the Prime.
There you can see the many programs that exist now. Science, games, engineering, astronomy, you name it.
It is interesting what you can do in games with an interpreted language like basic with modern hardware - you should try, even with the available connection kit from HP and the free PC/Mac calculator
You should take a look at them. You can download them to your computer and from there load them on your Prime