"We have the full European Playstation Store Update here at Ripten and Sony seem to have gone Christmas crazy again. The Warhawk Omega Dawn Booster pack was free for a limited time in Europe, and now it appears that Snakeball is free also - it could be a demo, or it could be the full game."
*Update* - Snakeball was only on the Australian store, and the "offer" was soon solved with a price of AU$12.95. It has since disappeared, and whether it will return is unknown. It hasn't made the UK update, but there is still a chance that it might appear.