Sticky Balls is a cancelled puzzle game that was in development for the PSP. As we can read on Wikipedia, the project was developed by Zed Two initially for Pocket PCs. After Zed Two was bought out by Warthog, a new version was in development for the PSP, until Warthog was bought out by Tiger Telematics and development was switched to the Gizmondo. The game was finally published for the Gizmondo, but it was different from the PSP one (that before being cancelled became more similar to Monkey Balls / Kororinpa).
At the Pickford Bros website (that worked on Sticky Balls) we can read some more info on its development:
Designed with the Pocket PC’s touch screen in mind, the game was prototyped on the PC in Blitz Basic and given to friends and people in the office to play, and even made available for free download from zedtwo.com, but not neccessarily intended as commercial product. The demo ended up being passed around the UK video game industry, and in response to the surprising popularity we developed the game a little further, and opened a website to keep track of hi-score tables.
Thanks to Userdante for the contribution!