This is the Locoroco christmas demo released by Sony for this holidays.
It's NOT required a custom firmware, you can play it also with the original firmware.
Copy the directory downloaded in X:PSP/GAME
Size: 7 MB
Software House: Sony Computer Enterteinment
Necessary requirement: Firmware 3.01 Original or CF
For more information visit: http://forum.tntvillage.org/tntforum/index.php?showtopic=109316