When some violent games are released in Japan, they don't make it to The Land of the Rising Sun with all their violence intact.
So red blood might be changed to green blood and the ability to kill innocent people might be cut out all together.
The blood-free Tokyo Game Show trailer for the Japanese version of Fat Princess made it appear as the title was the latest victim of Japanese censors. Kotaku contacted Sony Computer Entertainment, who told the site: "There was just no blood in the TGS version per show regulations. The Japanese version of Fat Princess will have blood."