This tutorial will show you how to play flash games off your MS. You can use these with an internet connection or not, like lets say you go to your grandparents and they dont have an internet connection you will still be able to play these games. Ok so lets go:
1) Get a .swf file game be it google or whatever i dont care how you get it and it doesnt matter as long as it is .swf file type
2) Drag & Drop the game into the PSP/GAME folder
3) open the internet browser hit Triangle
4) in the address bar type file:/PSP/Game/filename.swf
5) Enter And Enjoy!!