Instructions
Insert a Memory Stick into the PSP Go memory card adapter.
Connect the PSP Go to your home wireless Internet access point. Select the "PlayStation Store" heading on the PSP Go menu.
Select the "Search" option on the PlayStation Store homescreen. Type in "Castle Crashers" and press "Enter."
Select "Castle Crashers" from the list of search results and select "Buy Now." Select "View Cart" to see that Castle Crashers is now in the download queue.
Select "Confirm Purchase" and Castle Crashers is purchased using the PlayStation Network account the PSP Go is signed in with.
Select Castle Crashers on the next window to download. Select either the Memory Stick that was inserted, or the system storage to save the game to. Castle Crashers is downloaded and installed.