Patapon 2 Demo

In North America, the only way to access the demo for Patapon 2 is to pre-order the game. For those with a European PSN login, the demo has been available for download since March 13, 2009.Kotaku: PAL PlayStation Store Update: Pata Pata PS1 Games (March 13, 2009)
Eager fans of Patapon can reserve their copy of Patapon 2 now from select retailers. The game currently has a release date of May 5, 2009.
Free Flash Demo

For a limited time, from March 9 to March 16, 2009, an exclusive Flash mini-game demo of Patapon 2 was available from SPIL Games. The mini-game was fully playable on both PC and Mac computers and gave players a chance to experience the innovative music and gameplay of the title.IGN: Free Patapon 2 Mini-Game Launched for PC and Mac (March 9, 2009)
About the Game

Patapon 2 features 200% more content than the original game. There are nearly 100 missions, new characters, and special weapons and equipment. There are eight drum rhythms to learn, which are used to lead the Patapon army to victory. Seven music-based mini-games let players earn additional bonuses and upgrades for their army, which will level up or evolve into new forms as the game progresses.
Up to four players can work together in the multiplayer mode, or a single player can explore the multiplayer levels using the game's AI to control the other three characters.1up.com: Designer Hiroyuki Kotani Explains Patapon 2 Multiplayer Mode (October 8, 2008) IGN: Patapon 2