Due to the game running on a Java mobile application, the PSP “port” will be running on PSPKVM, a homebrew program designed to emulate Java mobile applications. This is a workaround to get games made on Clickteam Fusion running on the console.
1. Install homebrew like you would normally do, and then launch the game off the XMB and you’ll see the PSPKVM main menu.
2.Since you launched it for the first time, the game is not properly installed. To install it, first press start on "System midlets", then "Find Applications" and finally "Install from memory stick".
3. Navigate to "ms0/PSP/GAMES/THEBALLS/APPS/THEBALLS.JAR" and press start. When it asks for the prefered device, select "J2ME Standard (480*272)" and the game will start for the first time.
If you wish to play the game again, you don't have to repeat these steps everytime you launch it. When you launch the game again, just press circle on "theballs" on "Installed midlets".